Lots of people got into Rocket League because of the trading feature and lots of people make content out of it, but now they can't because Epic removed it. also people like to change up their cars with new items, and now the only way to get what you want is through waiting for the item shop to have the item you're looking for, or just see if you have a blueprint of it.

Because people like to change the look of their cars. And only ~20% of RL players play on PC, so 80% of all RL players can't use BakkesMod.

There is also the effect placebo. If you like the way your cars feel and look, you will play better. So that is one incentive to get items you like for your inventory. Another is to collect as many items as you can, sorta like Pokémon. Trading just adds more layers to an already fun game, casual though they might be. For designers and traders and the average player, trading is a very fun and important aspect of RL. Sweaty players might not know or care about it, and then mock those who do.

Lots of people got into Rocket League because of the trading feature and lots of people make content out of it, but now they can't because Epic removed it. also people like to change up their cars with new items, and now the only way to get what you want is through waiting for the item shop to have the item you're looking for, or just see if you have a blueprint of it.