how often does someone have a monster?

how often do they have TPWK or Mid/Bottom Pair - very often!

At my level (.1/.2 NL$20) a min bet, or near that, pretty much always screams weakness.

Also maybe its different at your level but that looks like quite a large river bet, I think 1/2 pot bet should be more than enough to encorage a fold - if theyre willing to let it go (tho I've heard others say 2/3 bet).

What would you do if you DID have AK, i know id bet about 1/4 or 1/3 pot at the river for a call, not 2/3 pot.

In this hand (apart from AK/AQ) you looked like an aggressive player on a flush draw, getting a free river card and not hitting. He knew you didnt have an overpair to his 10's and simply didnt belive you hit the river