If they are in mint condition, they can be worth quite a lot, but mint is rare.
It basically means never been read and always kept in the polyurethane sealer. There cant be any bended corners or sunlight discolouration etc.
If they are not mint condition they will be worth a whole lot less, even if they are 'near mint'.
Id check the internet to see if you can find a good place to sell em but why not keep them? I have a full run of uncanny x-men that I would never dream of getting rid of.