eBay will always side with buyers. They want to ensure eBay has a buyer reputation of total satisfaction. Sellers are screwed to satisfy buyers. Most of eBay's sellers these days are businesses, not individuals. They can absorb losses. Individuals can't. Sellers are expendable to eBay but buyers aren't.
Sell your music gear through KVR or GearSluts. Take the usual precautions.
Good luck