It's not a good example comparing the two. Sammies would be dramatically affected, much worse, than any Face by limiting their successes.
KarmaInferno,I like your suggestion about nonmonetary benefit past the 5 hit cap.
Not just to KarmaInferno:
As to the two being different think in terms of time.
The Sammie's fight a third to half of the session.
The Face gets to negotiate 1-3 times on average... once on pay, once on gathering info, and once after 'the turn'.
Despite the lack of spotlight-time someone intent on doing a Prime Runner face knowstheir massive dicepool will only matter for sure during the payout test, buying of gear, and maybe 1-2 other tests. The sammies will almost always get mileage in a given mission.
Tocap the face's one guaranteed spotlight-moment is take away a large portion of their fun.
The numerical comparison may not match but let them shine when its their time to shine in some fashion. Monetarily, non-monetarily, whichever, but let their skills show how awesome they are during their few moments to shine. To cap their one guaranteed time to shine is to relegate face-ness to a secondary role which may not be what the PC envisions.