I’d certainly agree eBay has changed, and not for the better, for private sellers. It’s not the place it once was a few years ago and is really now more geared up for the business sellers. Even so, it can still be a good place to both buy and sell.I've used it for years and it was fine, mostly buying, went back and had a few scammers clicking buy it now then cancelling immediately, asking to send weird ways, I had one good buyer but the rest were odd. It feels like it's changed a lot.
While a buyer cancelling (and for some reason eBay have actually made this easier) can be irritating as long as you remain within eBay and ignore any requests to go ‘off piste’ you hopefully shouldn’t end up being scammed and will, at least, still have the item.
Having said that unfortunately there will always be the low lifes looking to people rip off. Nothing is completely fail safe and eBay is no different. Whenever I sell something of any real value I take a look at the buyers feedback before dispatching the item. It hasn’t happened yet but if had any concerns I’d try to check these out to make sure all is OK.