In Smite some skins are limited, and therefore much more valuable.
I see people posting on this thread claiming to have "Limited skins" to boost value, this is simply not the case.
Here are the MAIN limited skins to look for
Arcon Thanatos - This skin was introduced for the first true world championship after Smites beta in the original Odyssey, very few people still have it.
Ragnarok Force X Thor - Same as above, was released the Second year of launch.
Poseidon - Released as the first Limited skin in Beta, very rare and was only purchasable for a week or so.
All others aren't truly "Limited"