I do, whenever I can get a deal.  The 'value' of catalogs varies and there's not a huge following, however, I LOVE them.  (okay, not in a weird way, but still.)

I really enjoy seeing how the old product lines were promoted and sometimes there's even special artwork that doesn't appear elsewhere.

TSR put them out.  I also collect all the old Games Workshop and as many Mini catalogs as I can because it's one of the only ways I can identify some of the old miniatures I have and collect from lots.

I've found some great gems that way! (Talisman figures mixed in with regular crap minis for example).

The Hobby Shop Catalog (TSR 80s) is probably the most 'popular' I think.

You going to bid on that?  I might put in a 5 buck bid on it if you're not interested.  (Unless a Newbayer wants to bid 80 bucks on it or something ;) )

-Jon