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Well, ugly bears would be useless, since tourists don't want to see them. And garbage eating bears would be useless since they don't contribute to the ecosystem. And bears whose organs are not known for their aphrodisiac qualities would also be useless, unless they were also aesthetically pleasing bears that tourists would like. Of course, a useless bear could become useful if properly trained for circus performances but, again, it would have to be non-dangerous.
Basically, I think you'd have to do some research into trends among different bear species, and possibly have a bear expert assess the bears' utility on a case by case basis.
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