Do NOT sell it for 50kk. Your ring is pretty much a PERFECT spawner ring. MB knows this and is trying to get it cheap.I'd give 50m for it
Is this man in your guild? If so influence him to keep it, no sense in selling an item that won't spawn with those mods and intensities anytime in the foreseeable future.Best you can do is to wait lets say... 1 week with selling and see what you are offered - this is preatty much a perfect spawner ring. If MB withdraws his offer by that time - too bad: there will be others offering the same gold and more.