I can't explain why bad players won't lay down high Aces ... even if they've missed the flop, but I can offer you some advice:
1. When you put your opponent on a hand like these, and you realized that they missed the flop, simply don't bluff ... your experience tells you it doesn't work, so stop! ESPECIALLY when the flop is rags. Your opponent is thinking, "Oh, well I have high cards, if I hit, I'll most likely win." (And he's usually right, in that respect.)
2. Following up w/ #1, it's tough to bluff people in low limit poker. Until you go up in limits, tighten up and bluff less. You should also slowplay less, and value bet more. It's a good strategy for lower-limit holdem.
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