Why not look to buy from places other than eBay? Sure eBay is convenient, but they wash their hands when it comes to dodgy listings, preferring instead to just take their cut and ensure the business is satisfying their shareholders. They are both judge and jury, so any dispute will end in their favour.
If you recognise there is a problem and have an issue with them, it's incumbent on you to alleviate your problems. You can only change your side, you will not change anything within eBay. Part of this is not throwing good money after bad. This forum is regularly asked if a purchase was a good one after the event. The principle of caveat emptor should rule. Do your homework in advance. Virtually nothing for sale is a one-off lifetime changing purchase. There is far too much reliance on others and their opinions, with taking responsibility for one's own action a distant last.
There is little point in 'bombarding' the seller with questions - all he has to do is ignore them. If you know something is wrong, don't buy it and report it.