I'm all for body mods as I have a few, but corset piercings are pretty silly in my opinion.
You pay all that money to have them put and and they look boring most of the time because the pictures where you see the girls with the ribbons in them, they can't be kept it all the time. so when you have nothing in, you just have a bunch of piercings in your back. Having the ribbons tied in , over time causes rejection and ya don't want that. So most of the time, they're just kinda "there." Ya know?
And plus, that's not something you'd want in for years to come. You'd get tired of them getting snagged on clothing and they'd be out in a year. So I wouldn't spend that much money on something I wasn't sure was going to be there for a while.
Girls do some weird sh*t I swear, it looks kind of cool, but I personally don't really like ink or piercings. Corset ones would be too far for me, plus I'm sure they would be a pain in the ass and would make sex awkward at times getting caught or just if he isn't into that. Ink to me always seems boring generally black, most people regret getting them and people look at you differently.
I've actually considered getting a corset piercing at one time, simply because I love the look of corsets. But I don't have the body for it, and even if I did, I'd probably decide not to because of the risk of them getting caught on something and ripping out or getting infected. Aside from the risks and potential problems, I think it's about as beautiful as you can get with piercings. But I wouldn't get it done myself.