Why is a Corporate SIN such a bad thing, anyway? Options

[Nawara]

Hi there, long time lurker first time poster and all that. Forgive me if this is a stupid question.

My character concept (Former Corporate Johnson/Social Adept) more or less requires a Corporate SIN. But as a relative newcomer to Shadowrun, I'm trying to figure out what exactly makes a Corporate SIN so terrible (-25 points). A National SIN (-5) or a Criminal SIN (-10) seem to carry more drawbacks in a lot of ways, since all the megacorps and governments have access to your biometrics and such if you get arrested. With a Corporate SIN, there's only one megacorp out there that does. It seems like the smart choice would be to just avoid doing runs against that one mega.

Sure, the book says that there's strong, violent prejudice against people who are known to have Corporate SINs, and nobody ever really trusts them, but...

1.) There's strong, violent prejudice against half the character types in the book. So it's not that unique.

2.) What smart runner ever really trusts anybody?

3.) How is anyone on the street ever going to know you have one if you just turn it off and broadcast a high-quality Fake SIN instead? It's not like your biometrics are on file in a readily accessible place.

4.) The biggest downside, really, seems to be that you're a walking extraction target if a random crew figures out who you are and decides you have secrets. But, hell, that seems fairly mild in comparison to other drawbacks that give fewer Karma back. It's not like being a Shadowrunner is that safe of a profession, anyway. And if anything, it's cool plot fuel for when the GM gets bored.

The obvious answer is that it is a really terrible, terrible thing, but I just don't get why yet because I don't really get the setting. So explain it to me. Tell me about all the horrible things that a GM is going to do to me if/when I take Corporate SIN. (IMG:style_emoticons/default/smile.gif)

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P.S. While I'm at it, what skills are required/recommended for a former Corporate Mr. Johnson now working as a Face? I was thinking about having him be a former associate counsel for one of the megacorps' internal security divisions, so I was going to max out Law, Corporate Security, Shadowrun Techniques, a second language (not sure which), Con, Etiquette, Negotiation, Perception, Intimidation, and Computer. Adept-wise, I was thinking about Astral Perception, Enhanced Perception, Kinesics, Spell Resistance, and Voice Control. Anything I should be sure to add, whether at high or low levels? Also, which corp would make for a good former employer? And should I consider taking the one-point Essence/Magic hit to get some augmentations like Tailored Pheromones or something combat-oriented?

Thanks!