I just pulled a valuable card and got it graded through PSA. Wound up not being worth it really for me. But that might be because I paid for a single card. At the very least you save some on shipping if you send a bunch for grading at one time, but the submission fee might lower in bulk too, don't remember.

The fee tho is based on how quick you want it done. I wanted it back within a couple months, so it cost me like 60 bucks. If you're patient it's a good bit cheaper (tho they did just send me an email saying they're raising prices). My card (fresh from the pack) graded at 9, which in my case looks like it's going about the same as ungraded, a little bit higher. Even if the card seems perfect, 8/9/10 is basically a toss up far as I can tell. My card went up in value a bit in the months the process took, so I pretty much broke even on the grading vs selling immediately. And PSA will handle the actual selling for you if you want, so that can be nice.

Anyway, that's just my experience, and it's n=1 so grain of salt.

From a collection perspective, I don't really see the appeal in owning graded cards. On a base level, I want someone to enjoy them and I think the grading tombs lower the aesthetic appeal. I don't want to put more graded cards into the world. But in some cases you just want as much money for your cards as possible. So grading might make sense for the valuable ones if they're in especially good shape. Check pricecharting for the cards you're considering for grading and see if there's a nice bump.