What is your definition of stealing?
If you go to the paypal website, https://www.paypal.com/webapps/mpp/paypal-fees, they specify 3 classes of fees associated with what you are doing. Buying is always free, sending money to friends and family is usually free, and selling something costs 2.9%.
What if you are selling your sleeping bag to your brother (family) who lives far away? Which do you choose? What if you are sending money to an someone you just met? Are they a friend? What if you are bad at choosing friends who turn out to be dishonest, but are good at picking honest strangers to deal with? The point is that friendship is a subjective notion. You can even have friends who don't consider you a friend.
Paypal is a smart business institution and chose their classifications deliberately--in fact, in a way that empowers the consumer. I get to choose who my friends are. They know people do this. And in fact, they couldn't tell you, in court or otherwise, whether or not Konrad and I are BFF, which makes creating a rational policy based off the definition of a friend worthless.
Konrad isn't being dishonest, but selling an item by terms he feels comfortable with (and is being completely EXPLICIT). Tell me how is that dishonest?
On a side note, there seem to be a number of posts where people (yes, this includes you MJ) don't get that this isn't some anonymous internet forum. People have histories here. didn't Ken Thompson just organize a meet-up? Konrad has been around; he is bpl tested and ryan jordan approved.
For example, I don't comment often but I do buy and sell. Why? Because I like to try new gear, even if that means fiddling with it in my front yard in the horrid flatness that we call Chicago. Here at bpl.com, that is just fine.
This is an open community where many types are tolerated (see bearbreeder, whose snarkiness brings a smile to my face everytime I visit). It's up to you what kind of member you want to be.