Guild Wars 2

Keep to sell at a later date or sell toxic spore skin now?

I’d say keep it and sell at a later date. It is unlikely that the supply will skyrocket, which means as they continue to sell, the supply will decrease and the cost will go up. However, don’t expect huge returns on your investment unless you plan on being extremely patient with your item.
I would at least wait until they aren’t available as drops anymore and a week after that you can look up the prices and try to speculate when you want to sell it.

not worth the invest – too much time to low price

The event should be over soon no?

Doesn’t matter. Supply is high and there are plenty of other better looking back skins. Anet will also continue to release new, better looking ones. Unless you’re prepared to wait years before you see some meaningful return, don’t bother.

Only looks nice on Plant armor.