I suspected it was something like that. eBay does not require PayPal, but you are required to use one of their approved payment methods. See eBay's acceped payments policy
On potential problem with Bitcoin is that it is irreversible. The buyer must trust the seller to ship what was promised. Most the other allowed payment methods can be reversed in the event of a dispute. In their choosing payment methods
page, eBay emphasises that every payment method is traceable. Bitcoin is traceable to a point: those that put effort into it may be difficult to associate with their annonymised addresses.
You may want to consider selling your goods in auction sites or forums that allow the use of bitcoin as a payment. Because of the irrevesibility of payment, you may want to consider a forum that allows you to build reputation. Since I don't have any Bitcoin myseft yet, I have not tried any of the sites listed here: trade: Material / Physical Products