Giving them some bonus attributes isn't game-breaking at all and won't effect you so much as its just 25%.Giving players advantages over other players on start? Not so cool. But eh, who am i to tell you what to do..
Really should consider not giving some players extra attribute stats.. Returning their donation points is completely understandable as this is something they pay real money for.
But a fresh start should mean fresh characters for everyone.
Its more of a way for me to say thanks for playing the first edition of the server, and yet returning to the server, rather than an advantage over other players.
I think its more than fair enough since the server was up for almost a month and those who played, kinda started when the server started.