2% max recommended unless otherwise noted. 1% max recommended for soccer.
For those holding the UNC 100 to 1 ticket recommended last month, I recommend a slight hedge by taking Kansas in the final (should be close to even money or slight Kansas favorite) to guarantee yourself a profit. If you hedge it well, you can lock in a very big profit. An example:
$100 on 100-to-1 pays out at $10,000
A $2,000 bet on Kansas would pay back about $1600.
If Kansas wins, you made a $1500 net profit on $2100 risked; if UNC wins, you make a $8,000 profit on $2100 risked. Either way, a guaranteed winner. Of course, if you want to just roll with the 100-to-1 for fun, then do that.