Yes, you can sell digital products on eBay. However, based on eBay policy if you sell stolen products or accounts or something that is not yours, there will be consequences, such as suspending your account, giving you a warning and other etc. Most people ignore this and continue to sell but sometimes they get caught, but some don't because people just love buying from them. I recommend you to NOT sell digital products on eBay because people can easily scam you, according to eBay digital product terms and condition, you have no protection. My brother experience selling digital products on eBay and I've been scammed around $250. From what I know, paypal adds fee for every product that were charged back, which is around 20 bucks, That's if the buyer uses CC chargeback or uses stolen CC. My brother sold to around 20 people and about 10 scammed him after 2 and half months.