With all due respect, that's absurd. Look at what Lucario Lv.X is going for on eBay. Then look at what Leafeon Lv.X is going for on eBay. There's a difference.
Politoed has a huge point here. For the most part, X cards that were released in tins go for a lot less. Playability is also a huge factor in what gives a card value. Lucario Lv.x goes for around 10 tops for the non tin one. Cresselia often still goes for 25. And Leafeon is still easily hitting the 40+ mark on a consistent basis.
I once sold a mint tin Lucario LVX for like $5 shipped on eBay and it only got one bid. I also sold a mint Cresselia LVX at the same time for about $31 shipped and it got a bunch of bids. This was a few months ago, but the same idea still applies today.