You need to pay the PCs exactly enough to keep them shadowrunning instead of boosting cars, not so much they aren't hungry for the next job, enough to let them buy new goodies, not so much they overdo it with gear, enough to keep the campaign advancing in power level alongside their increasing karma, little enough they aren't always suspected a setup/bluff, enough that it might still sometimes
be a setup/bluff, enough for it to fall in-line with the meta-profits a corporation will make after a successful job, little enough the corporations continue to profit by hiring freelancers instead of sending in-house assets for the job, and just enough to make them think every job is worth the risk.
The actual
number attached to those requirements is going to vary by GM and players and campaign, though, which is the tricky part.
Whew. There we go, that one's solved.

Next!