I wonder if I should keep a tye dye for a long time after its retired, then sell it for lots of money.

Yes, you can still use the old Tie Dye item after it has been retired, as it is only being taken out of circulation in the main shops, not deleted from the system. :}

Thank you :)

The question I have pertaining to the current poll is, will the current Tie Dye item still be usable if it's retired from the main stores, or would those owning the item have it replaced with the new one?

Thanks