The only real reason to have one removed is if it is being irritated like the one under your strap. IDK if they are considered the same as moles when it comes to pricing for removal. Moles cost about $600 here.
I don't fit into either category, and I have one on my back near the strap area too.
I just plain need to see a dermatologist and have a full body check. EEEEKKKK! lol