This sounds like a decent idea. But I have an alternate suggestion just to have more out there. A server I used to play on a while back would give you a couple points every round you played, then you could pay 30 points for a T round, and like 20 for a detective round. Perhaps something similar could be implemented with IC instead of these credits (obviously would cost more though)? You could limit to people only buying twice per map (but they can still get T the normal way so as to keep the uncertainty). Just a suggestion but it might be nice for people who keep getting inno.