Barry;
I collect them based on the casino name backs, these are ink printed on a printing press and should last a long time. Yes the heat printed fronts will fade but when and how much varies with the ticket and how it is stored. I have tickets 4 yrs old that are fine and some less than 2 yrs old that are faded,Since the majority of the tickets expire in 30 to 90 days you are not collecting the tickets for redemption value. I hope this answers you questions.
Jim