In general I agree with you Renton...and to be honest, I don't bluff much at $10 NL.
However, UltimateBet in general as a site is a little tighter than some other places. This leads to a few spots where bluffing is not a terrible idea.

I basically NEVER bluff at Pacific Poker, and I'm not likely to raise this type of hand there as there will be 4-5 limpers in every pot...someone is likely to call me down (and would have hit the Ace-small) - so I save it for my made hands and just value bet/protect.

As you can see in this hand, it was folded to me in the CO with an average+ hand. I was stealing the blinds but hit something playable. This would never happen at Pac Poker...always 4-5 limpers every pot there lol, which would turn this into a limp, check-call spot for me, with no bluff on the end.