I played recently alot ATCS. If there are less players, lets say both teams have 7, then alien feeding is OK for alien team, human feeding mean you never have a chance to go alien base. Really, if naked humans go one by another to a tyr, maybe hurting 20-30 hp and then dieng, its like neverending flow of tyrs going on your base. Even if you are in team of 3 chaingunners, 1-2 feeders on your team and you kill constantly tyrs/adv goons, nothing more. You got cash, chaingunners got cash, some of your chainteam die, they respawn and get battlesuit and chaingun again. Problem is, in even a such small map, its damn hard to get near of alien base and nade some alien buildings if you must kill 2-5 tyrs + alot dretches in your way.
It theres more players, 10+ on both teams, then human feeding is less important and alien feeding more. Those naked humans camp so tightly, that they protect structures pretty good. If there is enough spawns, tyrs can slash, but they will die before they reach your buildings. So, there are more humans, that means, if they rush as rambo, they less likely alone and less likely to be easy tyrfood.