The limp reraise/cap is an interesting phenomenon. I may give MP credit for a big pair depending on a read, but i think BB is just out there having a good time.

I bet this turn with so many players and such a big pot. If there is no overpair, which is more often than not, your K and/or Q outs could be live -- id give myself maybe 1.5 or 2 outs for them. You have alot of equity and with players that limp/reraise/ limp/cap, you should not worry about the field folding for 2 cold. Bet it, I say.

Edit: Against a maniac like the BB, I actually usually go for a checkraise here like you did. But I do think it's close. My mistake! NH