Why is Prestige select HN lucian so godamn expensive?

I was lucky enough to find High Noon lucian using some keys from an event and started playing him more.

Ive been saving orange gemstones since then but that skin variant is SOOOO expensive.

Why is that other skins go for 500 while being as epic as this one? Its 3 times more expensive and it would take me approsimatly a decade before collecting enough resources.