Marvel Comics Store Hulk

I just got tons of old Marvel Comics? ?

Originals not copys i even whent to a comic store for help they are in mint condish. what should i do with them?
(I have spider man daredevil x-man hulk wolverine and alot more.)
PS:why is the hulk grey?

The years they were made would be important in answering your question.

Marvel Ultimate Alliance 2 : how to unlock HULK THOR JEAN GRAY : joric18

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