This really is the only thing that DSP contributes to society - he begs mentally and physically handicapped people into giving him money so they don't have the ability to live normal lives out in the world.
His legacy is that on his death, the number of retards in the world able to afford a car or girlfriend, will go up. Long live the King!
eta: I just realized the other thing that DSP contributes is, ironically, a way for other retards to make money (Doody etc). So all his hard work every day is about taking money from one set of retards while simultaneously providing a way for another set of retards to earn money. His overall impact to the world is therefore a net nothing. Retards losing money and retards making money. It all balances out.