Fair enough, but on a board with two spades, if you are checking in mid position, a player may deduce that his "A"x is still good on the turn by reasoning that in a large, multi-way pot, you would have definitely played your "A"(J-K kicker), trips, two pair, with a flush and outside straight draw on board.

Now, I do see your point that if the players are so abyssmal, they may not see a check as a sure sign hero doesn't have an "A," trips, or two pair. However, that's a very risky assumption to make here.

Betting out also gives you a small chance of getting position on the turn (unlikely, but for one SB, why not).

So, if you are in any way planning to see this pot any further, betting out seems to be the best plan.

Argun