PayPal does link
http://www.aspkin.com/forums/ebay-su...tter-what.html
but not usually by IP address. In other words, under usual circumstances, at least today, you can maintain multiple EBAY accounts and log into your various PayPals using some of these same IPs, without much worry.
I use the word "much" because obviously one of these days PayPal is going to start tagging you based on IP matching too, same as EBAY does today. And, if you have stiffed PayPal for any money, then it's a whole different ball agme and you better believe they will go all out to find you - including by IP address.