honestly if you go on account selling websites, league accounts when down the drain with prices... You can buy a plat account for like $90-$100 no matter the skins.
it's pretty sad to see cause I wanted to sell my account till I found out over 300 skins is worth like $50 now a days ;-;
It's all based on the rank of your account.. the higher it is the better it is, no one really looks at the skins..
This is all my viewpoint as what I was trying to find when I was looking for accounts.. it was sad tbh.. i wish you the best luck <3 i have no idea what the account would be worth!