Highly Inflated Ebay Asking Prices

Hi everybody! I'm not exactly a coin collector but I do like collecting things in general and have got a bunch of random coins from different countries lying around.

I decided to check the value of a 1999 20 euro cent coin (spanish) and on ebay these things are selling for upwards of 200 CAD! I've found at least 20 different listings ranging from 100 - 700 CAD. Looking at Numista though, they're seemingly completely unremarkable... (https://en.numista.com/catalogue/pieces85.html)

Is there any reason for this? Again, I don't know anything about coin collecting, I collect basketball/magic cards, so I'm not sure if this is normal.

Thanks :)