I think nearly everybody can buy paysafecards but it's a to big risk because they can use their codes everytime they want and no real exchange is possible...
So my idea would be donation via egold.
You can exchange egold at the

to PayPal, PaysafeCard, Bank transfer etc.
And everybody can buy egold simple via paysafecard etc. so if somebody want to donate it's no problem and you gonna get more money for buying a good vps.
of course paypal would be good too but many people like me don't have paypal and won't get it only for donating ...