Stop this begging bullshit already!

Just for the sake of your own security, once people know your PayPal-Email they can, for example, send funds from a stolen account to your account,
which not only endangers your PayPal-Account but also your security in general, I don't know anyone who would do that, but there's always a risk!

This is a really good point! If people even put it in their signature, then they should ask for people to PM for donations.