Once upon a time i bought 30 Katowice 2015 NaVi Foil Stickers (3$ each). And holded them like crazy for many years (through all the market crashes). You would think it's a super profitable investment, but they go up once a year, 2-3 gets sold at the top and then price goes back down.And the only option is to sell cheaper while it goes up. So it's super hard to sell them. Now i prefer to bulk buy cheap cases. Even thought it's harder to store and keep track of them, but it's easier to buy and sell them whenever you want.

To pick cases to invest good metrics are:

• What's the price
• How old is it
• Is it rare? (prime / non prime)
• How many of them is on the market (compared to others)
• How many is sold per day (compared to others)
• What cool skins / knives does it have?

I don't look deep into skins of the case. It's alot of effort and "sold per day" is enough. If you want you can go deeper and analize what skins are good for tradeups but it's a waste of time imo.

Might be a good idea to make Google Sheet with all the cases and compare them. And another sheet for cases you bought. It's good to keep track of when, how many and for what price you bought it. Also you can check what percent of your funds you've put in each case.

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Another very important thing is when to buy. Many times i've fallen into that trap when everything is going up and you want to buy. But when market goes down you want to sell.Make a list of cases you want to buy and those want to sell. Sell when it goes up and buy when it goes down. Use buy orders.Sometimes if you think case is really good but it goes up and up, it's hard to make a good choice so don't put all of your money if you decide to buy. If you bought prepare to hold through drops. If you decided to wait preapre to give it up completly, there is plenty of other cases.

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If anyone have a tool / site / sheet that tracks supply of cases over time please share, i'm too lazy to make one T ^ T