Agree completely.
YHA's 'junk treatment' is often eBay's 'excellent'.
You can pay a few quid for loose carts or £20+ boxed. The rarer stuff goes up in price but it's still nowhere near English game prices. Looked-after boxes are in better supply, the art looks gorgeous, and being the original releases they have more collectable value to me.
Bigger library too. It contains some real oddities and I don't mind buying some I know I'll never play, just to have as a sort of boxy collectable card. Which is maybe kinda stupid but they look that nice.