That's a really good question, and I don't really know. Could be many things, like a fake discount where something is listed as previously having been a certain price without having ever been that. Granted I think that's illegal in the EU.

It could be that the box it's kept in has been damaged, but the item itself is fine. I've saved money that way before.

I also think these toys are generally sold at a decent markup. It's difficult for me to believe that the Edge for example actually cost ~100€ to produce, but since it's a relatively niche thing to sell (in the grand scheme of things) I think there's a markup to ensure staying afloat.

Now, I'd like to think that returned and used stock isn't put back on the market, but if I said that was the case I wouldn't believe it. People can do really heinous things.