If it's not enough for Hasbro, I'm sure it would be enough for some other company out there.
Well, there's a curious bit here. From previous discussions, it seems to me that the "Dungeons and Dragons" name appears to have value far beyond what the game brings in. The potential value (in terms of things that could be done in theory - like movies and merchandising) factors into how much you can sell "D&D" for - elevating the price considerably.
Someone who is only thinking in terms of the revenue stream from game sales probably can't afford the brand.
That, and it seems that Hasbro is notorious for only rarely letting go of a brand name once they own it. They tend to sit on them and allow them to lie fallow, rather than sell them off for someone else to work on.