Why are some stickers more exp...

I came across a cheap skin with a single sticker that costs 3x more than the item itself. Why is that? Do people really pay just for the sticker or is there some value system I don’t get?

Yes, some stickers, especially rare, discontinued, or tournament-exclusive ones, can be worth far more than the skin itself because collectors and traders value them for their scarcity and visual appeal. 

dino game

Some stickers are super rare, especially from early majors or discontinued capsules.

Yeah, sticker value often outweighs the skin, especially when the sticker is from a limited-time event or has a pro player's signature. https://dmarket.com/cs2-wiki/ explains how sticker rarity works and which ones are most desirable. For example, Katowice 2014 stickers can sell for hundreds or even thousands depending on the team and condition. When applied to a clean, low-float skin, they form valuable combos that collectors hunt for. Sometimes people even overpay for good sticker placement. It’s a separate economy inside the skin market.