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We are raising with what is the worst hand at the moment so it's a tough concept to grasp.

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You have to stop thinking in terms of who has the best hand at the moment. What's more important is the odds of you winning the hand after all the cards have been dealt. If you play a little pot-limit Omaha, it will help you get rid of that mentality very fast.

You have to consider your pot equity (the percentage of the time you expect to win the hand compared to the number of players still in). For example, you have the nut flush draw and there are 4 other players in the pot. You have a 2-1 chance (or 35%) of hitting the flush on the turn or river. If there are 4 other players, that means each player has a 20% average chance of winning. Since you have this equity advantage, you want to get as much money in the pot as possible.

In Roy Cooke's excellent book Real Poker 2, he explains it this way: Volume x Equity = Profit. Volume meaning the size of the pot, and equity meaning the chance you will win the pot.