I'd say 5k a runner is pretty high, actually, unless they're doing some pretty serious, life-risking runs.
Datasteal on a high-security Yakuza-operated casino? That'd probably net 5k base a head, especially if they can't "compensate" themselves in other ways.
Sabotaging a single-A corp's endeavours for five days, though? That's not going to net as much money, especially if the PCs are given some freedom in choosing how they go about it.