[quote name='encendido5']Do you know that what you're buying is rare and valuable, or do you buy stuff up on the notion that it will be rare someday? I'm still trying to get a sense for things that might be in high demand later on. The Zelda DS bundle is one of the things I'm eyeing, but I wonder if that will go the way of other so called "limited" edition runs.[/QUOTE]
Well, I normally just "know", I have previously collected games for years upon years and have done uncountable hours of research on game prices, rarity, etc. I still study my "Digital Press Rarity Guide" books in the bathroom from time to time. I don't collect anymore, but I do buy for myself and have my own personal collection. I do have instances where I don't know the price of something, that's when I call a friend and they'll do a quick ebay search for me.
Also, I don't buy only rare and valuable items, a lot of the Game Crazy stuff I bought will sell for maybe 5.00-10.00 each. The thing is though, it was CHEAP, so if I sell a game that cost 1.00 for 5.00 + 4.00 shipping and handling, I still come out ahead with about 6.00 after fees, shipping and such, which is 4.00 profit. 4.00 X 10 = 40.00. It all adds up.
I NEVER buy on notion, EVER, you'll most of the time be wrong...but I think you're heading in the right direction with the DS Lite Bundles as I thought of the same thing myself. Honestly though, as for high demand and ebay holiday prices, watch the Nintendogs bundle instead of the Zelda. If you remember a couple years ago they released a DS Fat Nintendogs Bundle that skyrocketed in price...and you'll have more parents buying Nintendogs bundles for their kids rather than the Zelda bundle. It's too hard to judge what will be valuable later on, you'll waste lots of money just buying things like that, just be sure to stay on top of what you are watching and the minute it goes up in price...head to the store! Think about it, who'd have thought that Pokemon Box would have sold for as much as it did? My eye was on Dragonball Z: Budokai 3 Limited Editions...boy was I wrong.
Always be one step ahead of the general public, it was nice walking into 5 stores, stocked to the brim with TMX Elmos on release day last year, sold those suckers for 120.00 each.
Just don't get too greedy, always let a friend grab a game they want before buying it for profit.
EDIT: I don't only buy games though, I do lots of DVDs, toys, cds, etc. Just whatever brings in a buck.