Nice little gold sink, I would like being able to pay to clear IAC rather than grind it out especially on RNG type levels.. Currently 1k SU gives 20Plat XD.
It should be maybe a 10 to 1 ratio. That way 1 new minion would cost roughly 400g with master trader. Blasting through levels should come at a steep price but getting an extra couple guys shouldn't break the bank.