-Oh yeah, No "Matrix" sourcebook.

Anyhoo - playing with the "Virtual Host Generator" and a mocked-decker (Who is actually not-half bad, sheesh, practise, no?) I managed to get in and out with a minimum of fuss and bother...
So, how do you allocate the value of payadata? No, not the "I'm going to need some info on this before my team blows it to hell" data, things like accounts, information, secrets, Dragon porn...
You know, stuff that a successful data-broker would be interested in acquiring?
I was wondering if there was a formula, like, say, Host Security Rating x Difficulty (Access) x sixe (MPs) =

So for 50 MPs from a Orange 5 (easy, I know

Size = 50
Host Security Rating = 3 (Number of init die. Red = 4, yes?) x 5
Host Access = 9:
=

Is this too high, should I just say "Ok, 10 Nuyen for 1 MPs?".
I thought there'd be more in the way of Paydata because deckers seem to burn through dosh faster than a sammy with access to a delta clinic, in programs alone.
And I assumed the usual "Lucky to get 50% of the actual worth" rule of thumb applies for Information as well?
(I use a 50% of actual value with a 5% increase in profit from every successful Negotiation dice. This really limits the "packrat with a chainsaw" mentality of looting bodies, homes, etc. How much can you carry, eh? Oh, like to see you do a dodge roll holding that. Yes, I do mean right now...." )
Flames, criticisms, ideas? Fire away. And if someone's covered this, please point me in the right direction. Thanks.
L.