It is a good idea. Actually many account holders wait for a long time to get account back and for negative tag hacker also cant be benefited. But if you do this service then hacker as well as real owner both will be benefited. And this 25$ will be considered as punishment of the real owner as not to protect his/her account or mistake of his/her or any bug of the forum.
I have a suggestion. By this service it will take a lots of time of you. So it would be better if there is a little fee (considered as service fee) of you.