Most of them aren't worth it, but luckily its usually easy enough to tell from the previews which are or aren't. The sets worth paying for are few and far between but the Frieren lingerie one definitely was and the Juri one isn't bad either.
Point being, I'd say unless you just a really big fan of hers, you aren't really missing out, so you shouldn't really be worried about fomo if that's the concern.
Not sure if this forum has rules against organizing pay sharing or pooling, but I see very few people talk about her private sets.
I wonder if she'd be willing to sell even more exclusive ones for higher prices (Near lethal levels of hopium here)
On a similar topic, she also claims to send exclusive photos of outfits you buy off her wishlist but I've never seen any