If you had a couple hundred dollars laying around that you wanted to invest into guns. Would you buy say 5 of the PSA lowers at the $50 price they are right now, or would you invest it into something else?
Investing for the sake of investing, no. Buying 5 at a time because of a sale and no real plans for the near future, no. They run the sale several times a year. If you've got plans for them all, sure why not. As far as investing in something else, since I've already bought 2 of the PSA lowers, I'd probably pick up a j-frame.