The cost/benefit analysis still comes into play. If a live security mage costs too much, then you're going to look for alternatives to that live mage. Biofiber, wards, guardian vines, and all those tricks will be very useful in this regard.
However, when it comes to protecting your guards (also a significant investment, IIRC a Blackwater merc makes $150,000+ a year, plus the cost of training and cyber) the only forms of spell defense is either a live mage or a spirit with Magical Guard. Both are highly expensive.
However, when it comes to protecting your guards (also a significant investment, IIRC a Blackwater merc makes $150,000+ a year, plus the cost of training and cyber) the only forms of spell defense is either a live mage or a spirit with Magical Guard. Both are highly expensive.
Dude, you're just repeating yourself. Expensive doesn't mean squat. You are assuming, without argument, that security costs more money that it saves. That is flat out crazy. If it did, they wouldn't spend so much on it. Security must protect at least as much investment as it costs, otherwise they wouldn't have it.
Chances are, being that these are corporations for whom everything is the bottom line, they use cost cutting measures to ensure that security always costs less than the money it saves, making it a net gain. Things that cause a net gain in loss prevention are not expensive. They are free, because the money you spend on them is money you would have lost if you didn't have them. That money can be completely written off as offsetting a loss -- by preventing losses, security pays for itself.
Things that pay for themselves are not "expensive" as you put it, they are money makers as far as the balance sheet is concerned. An investment that costs 150k and saves you 250k in losses that otherwise would have occurred is not an "expensive" investment, it is a very smart investment that returned 60%. And they don't even need a 60% return -- I'm sure that on something like security, they can scrape by with as low as 2-3% return. As long as security isn't a drain on capital, they can spend as much as they want on it. The only time they have to stop spending is when they're overspending, where security costs more than the losses it prevents. But you're going to need quite a lot of security before that hapens.
Also, you're still assuming, without argument, that salaries in the 2070s will be comparable to salaries today, even after having been refuted. Rentacops are not even comparable to blackwater mercs. Blackwater are soldiers who are too hardcore for the regular military, almost all of them are ex special forces, and they probably left because they'd rather tromp around and shoot people than become officers. Blackwater are essentially elite mercs, so you can't use their salary as the baseline corporate security guard. The baseline corporate security guard sucks really badly, if you check the grunts in SR4A. His primary job is not really to go toe to toe, but to trip the alarm and summon the high threat response or turn on the automated defenses when Shadowrunners show up. The baseline guard has only average combat skills and physical abilities, he's probably got no military training or education. He's probably lucky if he can pull down a Middle lifestyle, which is 60k per year.
And let's not forget, corporations who own their own enclaves can probably provide a lifestyle to their employees at below cost. A mage might expect a high lifestyle, but instead of it costing them 120k per year, it would probably cost significantly less because they don't have to profit, they can get things for their employees at cost. And you're making the faulty assumption that wagemages would get paid a serious cash salary. That sounds like a dumb thing for the corps to do. You don't pay employees cash, that lets them do what they want and buy what they want. And the worst part is, they stop needing you. A mage who made double his living expenses could leave the corp after 10 years and not think twice about it. They don't want that. I imagine that they provide employees with living expenses, plus a certain amount of corpscrip which can only be spent on things available from the corporate stores. That way they keep people dependent on the corporation. For mages, they doubly need to keep them on a tight leash, because they're afraid of the things that a mage can do against the corp if they become disgruntled.
If you think that they treat mages with the utmost solicitousness, you're way off base. They give the bare minimum they can. Why? Because competition is not real in the 2070's. The corporations don't compete with each other on salary, because they all pay the same crap salaries on the same crap terms. What they depend on are programs to root through existing corporate citizens, find the magically awakened, train them, and indoctrinate them into willing wageslaves. They are not like today's doctors, they don't generally graduate college and become free agents to the highest bidder. The very best might be like that, but the vast majority of mages, like the vast majority of everyone in Shadowrun, are basically serfs belonging to corporate interests. You're thinking free market economics when it comes to employment, and you're flat out wrong. You should be thinking more like corporate feudalism.