You don't actually need to buy the items to get the files, you can just grab them from the preview in the shop.
For this post specifically you can just copy the video link directly (using a web browser, not the steam client), but other types of items require dev tools/inspect element.
I'm playing 8 gachas right now, definitely doable if you manage well and treat a few of them casually without letting FOMO get to you but I feel like I reached my absolute limit, if I want to pick up a new one I'd have to either drop one of them or abandon the thought of playing "normal" games for a while. That said I know people who play like a dozen of them.
As for whether it's worth it or not, it's your time and your money, only you get to decide.
