The numbers mean less when you have identified a loose player. Rippy is right. You should have a little voice in your head reprimanding you exactly like he did. You should have been salivating, knowing some chump is betting into your power hand. Since he's going all in with $12, that means he's well below the table buy-in limit and is probably desperate to make something out of his Ax hand or is trying to steal the $5 that's in the pot already. If he was a consistently tight player with more cash, you may reconsider.

I'm not an expert, but I'm starting to take all factors in to consideration more frequently and it's paying off. The people on this board have helped greatly with my decision making.