Cool suggestion I'd say.

Sure it does add another venue from which one can earn a Token but given that a usual reason for auctioning off players is that you can't get anything more out of them and you might as well get some better cash than the "Release" function offers, getting a single token out of an auction doesn't sound bad.

Even if a Manager sells off like 10 players from his squad in preparation to get some new talent, it MAY still take 5 or even more Tokens to get one player (As Tasoulicc suggested), so in the end, there won't be a huge influx of free Tokens.

But at least this way, the return from auctioning will be slightly greater.

Of course as with all other suggestions, I will be bringing this up to the devs!