Bluff now or later?

[emil3000]

OK, simple hand, I know. Just thought I'd get some quick agreement.

Everyone said to check behind. I agree. I checked. Everyone said to not bet the river. I disagree. I bet $50, half pot. I am laying 3:1 here, I think it will work more than 1:3. He probably can't read hands, and will likely call with second pair or better. I think he has that less than 1:3. He won't bluff raise me.

BTW he had 9% PFR so far, which isn't exactly very aggro, but not that rockish either.

He folded.