Pot sweeteners?

[Allinlife]

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5 to the flop, I have position w/ Ac4c. Flop Qc 2s 3s. Bad player in the small blind bets 70 into a 100 dollar pot. All fold to me and I call. Turn Kc. He checks. I bet 125 and expect to win the pot like 15% of the time on this street but almost never expect to get check raised.

Pretty standard?

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I would like to know why you never expect to get check raised there?

also I'm kind of lost about the reason why you make this semibluff if you expect it to get called majority of the time? is it to set up for a river bluff?