Yes, a maxed infiltrator is a hit an run machine with god chances to infect.
But once you have it all, it just stops being interesting... i like to level, so that stops after a certain point.
my idea was skills like +1% for 50 points or 75, same with +1% bite or claw for 100
But you could buy these skills over and over, further improving your Z even after you bought out your class tree and the general.
Oh, a flat, repeatable skill. That wouldn't be terrible, but I'm just not sure how many rounds we have in which an appreciable amount of fasts max out.
It's 350SP for bite, 375 for infect, 100 for bite regen, and 150 for scent blood and 1000 for climbing. Then if you max, there's another 500SP of useful upgrades to regen and scent blood. That's a chunk of change.
The Strong doesn't have to buy all those general skills. All the strong needs is claw.
So a functional Strong costs 1700SP. A nice fast costs 1975. A maxed fast costs 2475.