[StellarWind]

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An important reason not to raise for a cheap card is you may get a free one. Even if the flush doesn't come there is a very good chance that overcards won't bet again.

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I seriously doubt that there is any chance of getting a free card in this particular situation.

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Do you see the contradiction here? There is plenty happening on this flop beyond the fact that two cards are the same suit. Almost any card in the deck could hit someone hard. And yet you think it is nearly impossible to get a free card when you miss but very hard to raise when you hit?

The truth is they can't see your hand and they must guess how to play the turn. If SB has overcards with a high spade he is actually much more likely to bet the third spade than some scary card that does nothing for him.

Your opponents are not perfect. They will bet when you hit. They will check when you miss. Not always but quite often.