It depends on how much work it takes them. Can you estimate how much work it takes to also provide Firefly, once the vendor has the SuperFly done? Are there automated helper converters? If it's taking them an extra three days a month to do Firefly then I can understand why they might be weary of it. But if it's only an extra three hours a month, then they should keep on doing it so as to get the widest audience possible. The other question is: would Renderosity even permit such a move? Because once they let one vendor do it, the risk is that the other vendors will all follow.

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