If only users would read the user agreement they would know that eBay does not guarantee the existence, quality, safety or legality of items advertised, or the truth or accuracy of descriptions".
In other words, descriptions here may be (and sometimes are) untruthful or misleading, and items may be poor quality, unsafe or even illegal. Who would buy from a shop that stated this? eBay is a jungle.
As regards photos, eBay does indeed now allow sellers to copy and use another seller's photos. So not only may the item not match the description, the photos may not even be of the actual item you will receive.
Certainly there are bargains to be had on eBay, but buyers have to be very, very creful - especially for anything of value or safety is critical.