[gobboboy]

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You aren't only valuebetting or bluffing, sometimes you are betting to protect your hand. For instance in the 99 hand mentioned in the OP, if you think your opponent has AK and won't ever put more money in the pot if they are behind, it would be correct to raise so as to not give 6 free outs.

Note that I don't advocate raising there at all, just saying that this is theoretically a reason to raise as well. Saying that you are either valuebetting or bluffing is a bit simplistic.

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I disagree strongly, there's nothing about 'protecting your hand.'

If you're betting because you think your opponent has a draw and you have more than 50% equity, you are VALUEBETTING. It does not matter what the draw is. But regardless, in the 99 hand you are NOT 'protecting your hand,' you're bluffing because you do not expect worse hands to call but it turns out if you get called by a draw that you were in fact valuebetting. If you happen to bet J9 on the flop but get called by 98, were you trying to 'protect' your jack high? No, you were bluffing and your opponent happened to have a hand that could call a bet and you were still ahead.

If your opponent has a draw, they're either correct to call you or they're not, but regardless of them being 'correct' to call you, any chips that go into the pot means you ARE gaining chips in the long run if you discount implied odds.