Debt collectors who have no power and you'll only get a CCJ if they take you court (very unlikely) and they win (even more unlikely unless you don't turn up).
If it does actually get to that point, you just pay the money within 30 days and you can have the CCJ removed from your credit record.
You haven't entered into a credit agreement with PayPal, so they can't do anything to your credit record without taking you to court (as above).
They've made the decision to pay people money for an arbitrary reason, what makes you responsible for reimbursing them for that decision?
Sorry, but you are all sorts of wrong. Credit agreement or not CCJ's appear on your credit report and CCJ's are not solely for defaulting on credit agreements.
Paypal themselves will not take you to court, they'll sell your debt for pennies on the pound, the collections agency will add their fees and they absolutely will do their utmost to enforce the debt.
As for not turning up in court, that is the absolute worst thing you can do, how the hell do you expect somebody to defend themselves?