Just what Scott said, Ebay blocks Paypal funds if something does not go smoothly with a purchase, that is the main reason why I would worry. I had a point in time where I wanted to sell something and I did not even know Ebay was punishing me for transactions from ayear prior and I had to pay out of pocket for shipping. They told me they would cover me on shipping, just go ahead and get a label. When I did it withdrew from my checking account. The next rep told me I did it wrong, I said no the rep before told me how to do it that was what I was told. They apologized but would not refund for the time being.
They were punishing me because last summer because a few buyers left me avg 4.7 stars for shipping, despite all positive feedback Ebay zinged me. Back then I had a few packages returned to me because of incorrect postage amounts, I even messaged to buyers to let them know what happened, they left me positive, I gave refunds on shipping. Back then ebay did not punish for stars, but those old transactions carried over to this year! Now I know how to ship from home electronically, except for international packages.
My overall point is, is that it's unfair how Ebay blocks seller funds because of stars. Especially 4 stars or above!