Ways to increase my feedback

I was thinking about making 10-20 fake ebay buyer accounts, with different IP addresses and bidding on made-up products from my seller account, then giving myself positive feedback.

Do you think this could work? Does anyone have any other BH ways I can increase my seller rep on ebay?

You would have to have the same number of PayPal accounts all on different IP addresses. They will still know what you're doing. A number accounts made around the same time, all repping the same account for, most likely, low amounts and random things. It would be a red flag to eBay.