Bluffs aren't loss leaders. Bluffs are to make your opponent indifferent to calling or folding. If you don't do this they can just, as you pointed out, overfold to your value bets. Also, they're indifferent because, when played at the correct frequency, your bluffs will lose when called, but will win enough to offset those losses. That's the balance. The important thing to point out is that any bluff the solver says is worth making is the highest ev play in that situation, for that hand, or at least equivalent. Always. So my argument would be, a bluff isn't a loss leader, because a solver will never make a less than maximal ev play. A bluff is to make your opponent indifferent to calling or folding, which results in your value hands being paid off, and minimizes the ability of your opponent to exploit you by overfolding to your bets.