I've had evenings hunting Trox and making a profit ( after ammo and decay costs ), either with Kats Valor ( high decay cost ) or MK II ( lower decay cost ).
In fact... I've had that with most mobs... sometimes good times, sometimes I break even ( most times it is slightly lower than break even ) and I've also had plenty of times where I had a good loss ( 20+K ammo and decay )... I don't think your winnings / loosings are mob related. Only your skill gain is.
good times, bad times... it's almost like reality
But maybe indeed make sweating easier or allow sweating longer. More supply will mean lower prices ( if demand doesn't rise ).
One simple way would be that noone buys sweat anymore... ( yeah, anarchy
), that way the price would drop to nearly nothing. If all buyers agree not to pay more than a certain price...
But then again, how to get all buyers united like that