Donation only gives access to 2 powerful playertypes, and it's just 1 per team. A warden, and a streaker. It is a small boost, because of the fact that there are usually several guards that can kill the Streaker. If there is a warden and you are thinking, "He has a speed boost, I won't be able to escape!" Then you are wrong, because of the fact that you can get speed boosts without buying anything.