I love paypal, and I live in the UK. Paypal is essentially the default checkout option on most websites, and supported pretty much everywhere. It is very, very handy as a consumer, but never in a million years would I sell using paypal (too many horror stories about frozen account and kafkaesque support staff)
I have probably used paypal twice? in the last 15 to 20 years in the UK. I'm not sure why I would want to use it outside of eBay, where fraud is apparently rife.
Paypal is indeed less use din Europe because we have wire transfers (that take three days, except if you get the "immediate one" which in France is premium (premium destinations (i.e. other banks), not price which is zero)
Ah, and we have cheques in France too. Yes, the paper ones.
PayPal fills exactly that gap for many merchants (by supporting SEPA Direct Debit, which is ubiquitous but has effectively no fraud controls or online amount pre-authorization).