I agree with Robert Touts, I wouldn't chose casino chips as an investment. Most collectables have a very poor investment value unless you have a lot of money or are an established dealer. I collect chips for fun & to trade - I've never sold a chip for cash & doubt I ever will.
If you want an investment buy bank CDs or secure bonds. Everything else (stocks, chips, baseball cards, cars, comics, etc.) is gambling. But that's just my opinion.