I'd like to piggyback on Aggy's comment about Brandon Sanderson.
He sold his thirteenth novel. (Neat fact, btw, I didn't know that.)
But there's no reason he (or you or I) couldn't use that experience to go back and revise earlier novels, now that he'd found his footing. Some novels are trunked and should remain that way. But some are just waiting (I hope) for the writer to develop the skills to make them sing.
So just because you write and and trunk it, doesn't mean that's its ultimate fate. At least, I'm hoping that's the case, although it certainly can't hurt to wrote with an eye to what sells.
He sold his thirteenth novel. (Neat fact, btw, I didn't know that.)
But there's no reason he (or you or I) couldn't use that experience to go back and revise earlier novels, now that he'd found his footing. Some novels are trunked and should remain that way. But some are just waiting (I hope) for the writer to develop the skills to make them sing.
So just because you write and and trunk it, doesn't mean that's its ultimate fate. At least, I'm hoping that's the case, although it certainly can't hurt to wrote with an eye to what sells.