It's hard to get paid off when you flop the nuts like that unless someone else has the 6, then you see real fireworks.

If my opponents are pretty aggressive i will try and slowplay there, hoping the button or CO makes a play at the pot that you can call and continue to check/call till the river. If they are tighter, i'll just lead out and bet...A tight player isnt putting much money in there unless he made a set of 6's anyway, so maybe you'll get lucky and get a call from someone with the 9 or a draw.