I guess I have to do the math for ya'll since you are just making assumptions
400 spins/hr with a 10% house edge on the .25 slots = .25*.10*400= $10 loss/hr
60 bj hands/hr at $2/hand and 14.5% house edge = $2*.145*60 = $17.40/hr
Even if the ploppie were able to do 600 spins/hr on the slot machine which I HIGHLY doubt the vast majority of people do, that's still less than what the casino is making from BJ.
Granted these numbers could be skewed based on how good the ploppie is at BJ or the payouts on the slot machine but on average I believe the slot machine is the better deal for the ploppie.