Simply put, the better you get, the more you should get paid. I pondered this for a while, and played around with some computer simulations, until I hit upon something I find to be ideal: the book prices are the
standard run prices for a starting shadowrun character. Someone who's been in the biz and is still at the sharp end ain't gonna get paid the same piddly amount as some grunt shadowrunner just starting out.
"But Wyrm, how the hell do you figure out how much a PC is worth??" Simple, says I. At character start, assemble this clever little formula:
1 + [ (Street Cred - Notoriety - Public Awareness) / 10 ] = Runner Value
Whenever you give Street Credit, Notoriety, or Public Awareness, apply them directly to this formula; even if they burn Street Cred in order to reduce Notoriety and Public Awareness, the people in the shadows (and those who hire them) are going to remember it. Similiarly, if you consistently do a bang-up job, they're going to remember
that, too. Also, don't forget to add the 1 SCR for every 10 karma they receive; again, this SCR is added directly into the formula. If the players have formed a solid team, you can use their averages of the above formula to get how much they're going to be paid.
If a character keeps being loud, they're going to get paid less than standard; if that 'being loud' was at the direction of the Johnson, on the other hand, you might consider balancing out the Public Awareness penalty you gave them with a Street Cred bonus, for doing the job just the way the ohnson wanted it. This
will penalize people who mess up immediately after the run in which they mess up, and it may take them a few runs toeing the line to get that back; unless they're consistently loud and obnoxious, however, their rewards should slowly creep upwards as they gain in competence until they're getting paid two, three, four times the standard amount.
A sideline thought, in regards to making extra cash via 'Brokerage X': must possess Street Credit - Notoriety - Public Awareness of 5 or more in order to be contacted. (Or whatever minimum you, as GM, decide.) Loyalty is never more than 1; Connection is never more than 4. Monthly earnings are equal to [2d6 + (2/3 * Average Karma Earned on the Month) - 3 ] / 200. This, multiplied by their current investment, is the amount gained for the month. Yes, this means that if you don't go on runs and call them up to tell them what's going on so that they can, you know, do insider trading, you don't earn as much, and may in fact lose money. Additional modifiers as per
Loose Alliances can be added directly (not multiplied by 2) to the above formula
before dividing by 200.
Note that this really can be an incredible rate of return, since it compounds every month, doubling an investment within three years. This really is fantastic, and if a smart runner adds 75-90% of their ill-gotten gains, it will go up
fast.