I would never do it, but I think corset piercing is very pretty. I've heard there are quite a few problems with infections though, and I couldn't imagine doing anything other than standing with them in.
There's a lot of problems with infection with anything (piercing or tattoo) that gets covered with clothing before healing. Plus you can't really reach them so you would have to have a diligent friend to help you out with that. I know a few who have them and once they heal you get used to the sensation pretty quickly.
Okay... about corset piercings... usually they are just done for an event, frequently in the BDSM community. I've known folks who did it for an event and at the end of the night, every loop was pulled out and the area cleaned, smeared with Polysporin and bandaged up with Bandaids. Very few folks go permanent with that kind.
I would have loved to get piercings but I went with the tattoos because piercings have a heal time that is too long for me. I had wanted to get my nips, hood, and eyebrows done. (Sorry Marsha...) I used to have my ear lobes pierced when I was a kid, but I let those heal over a long time ago.