I agree that it's ridiculous, but it's their perogative to charge whatever they want, in whatever way they want to charge it. I'm just thankful that they didn't raise their prices this month - PayPal is the ONLY thing that didn't go up for me! My product costs me more, the Canadian dollar is way up, Canada Post fees are through the roof, and eBay fees just jumped. I wouldn't be surprised if they're just "staggering" the increases, though... look for a PayPal fee increase this spring. 😞
"Some sellers on eBay will tell buyers to add on a certain amount if they want to pay with PayPal to cover those costs."
Unfortunately, this breaks eBay's rules, is a reportable offense, and can get you warned or NARUd. I noticed a very well known seller (in the same line as me) who was doing this. I reported it, and checked back in a few days to find that he had been banned from eBay. Woops!
*snickers and hides*