This is basically why it's profitable. Because draws generally have stable equity across a variable range of hands, yet variable equity on future streets, it some instances it benefits from just getting the money in when your equity is the highest (aka the flop).
Originally Posted by nish81
With a very strong draw, like a combo oesd and flush draw, we usually have the best hand on the flop, as we have 15 or so outs. Therefore, we can reasonably bet/raise/shove whatever on the flop in most cases because we have >50% equity against villain's stacking off range. Which means this hand fits in our A range, and should be played like a nut hand.
With other strong draws, such as oesd or nut flush, etc., we can also profitably get the money in on the flop. This is not because we have >50% equity against villain's continuing range. However, it's because we are semibluffing with like 36% equity, and we have enough fold equity for it to be profitable. Therefore, we can bet/raise and benefit from fold equity when villain folds better hands. And also still have the needed equity to get the money in if he shoves with his other better hands. As fold equity decreases, so should our frequency of betting/raise on the flop, as we know it's not profitable to be putting in money with less than <50% equity if villain doesn't fold often enough.
With weaker draws, like non-nut flush draws, gutshots, etc, while it still might be profitable to bet/raise on the flop, it becomes a bit less profitable. Because in most cases other villain's are playing their ranges in a similar fashion, which means in most cases they are bet/shoving their nut flush draws, and other nut hands, which means with a weak draw we could be getting it in against no only made hands (which we are behind), but also better draws (which are usually crushing us). So these marginal draws likely benefit from being played a bit more passively and calling, instead of raising.
But yes, we can raise/shove draws on the flop in most cases because of fold equity, and it also balances our ranges, which leads to getting more action from worse made hands. If we see a flop where we only raise our nut made hands, such as sets, if our villain's realize that then they can play pretty straightforwardly against us. If we raise our draws and sets, they can make quite a few mistakes in some spots.