Most toads are wild caught anyway and American Toads are plentiful all over the Midwest. If it was a rare or endangered breed I'd say return it to the wild.

Breeders don't focus (at least I've never found one) on toads because the froglets are so small, they take a lot to feed/grow and they are a cheap amphibian, at least from what I've seen. Any ones I've bought from pet stores or at shows have been wild caught.

$15 cane toads, $3 american toads, $8 eyptian toads, hah... No money to made there after all the bugs they eat. They are money pits, little holes in the ground with cute mouths.
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To be honest though I'm glad people don't breed them. The tadpoles are small, the toadlets horribly fragile and hard to raise - you get the strong ones that survived out in the wild, instead of some sickly, possibly inter bred frog or toad.