So what I should probably have done here then, was to bet 1/3 of pot in the first place, and not check like I did. I agree checking was not such a good idea, but when I think there is like 2/3 chance I'm beat I tend to check instead of raising, hoping to get a cheap turn, even though raising 1/3 of pot would give me good odds.

So if I raised by 3 then, it is like 1/3 pot after my raise, and they reraised a lot I'd fold. If they fold it's great, but what about if they call it? And on turn it is say some low card noone most likely can use. Do I keep betting, and if so, how much?

And if it's a spade on the turn, my 1/3 raise on flop would give them more than enough odds for going for the draw. Do I keep betting, or check?

And all I mean with calling/raising being expensive is that I don't think it gives me +EV to do it, but that's probably wrong, doesn't mean I'm worried about losing more chips.