I concur with, "Altnors" request.

"The cost for a 4th fighter either needs to be dropped or earnings need to be boosted."

"In-App Purchases" are a tough sale to those who have already spent anywhere between $.99 to $4.99 for the BASE level game itself. My simplistic reasoning in these matters leave me with a possibly ignorant solution by mumbling, just up the app to, $1.99?

ROADKILL_101 about Brutal Street