Because when PayPal freezes your account without consideration to resolving issues, that is it, they will not release any funds for 180 days, I needed to pay rent and so, the only income I had was from PayPal, and over 2mil has gone through that account and they freeze it because of some algorythm, gracias a Natwest
for example some one paid me £2,000 for some widgets, I send this but I can not withdraw my money from them, the only way to withdraw the monies, is to refund the customer and take the chance they will re-pay me via bank transfer.
One time in Xmas 2011 I think, they held £18,000 of my money for nearly 3 months, so I learn from this never again.