Three is risky, yes... but this game is about taking the right risks.
If you've got three trades left and a decent 18th man you can survive without using those trades if someone is suspended for a week or two.
I'm hoping to have 5 trades and 18 players maximum. I am taking a big risk but I think that I might have enough trades spare to pull it off.
Currently 9 trades.
Hoping to have 13 play in round 18 and 17 in round 19 depending on trades between now and then.