Honestly, I would say it depends on how much you like the character. Look, I love XM pieces but there's no way I can justify paying $850+ on a bunch of 1/4 scale statutes I like. At XM prices I have to be real damn picky. So, I PO'd only the statues of characters I had to have and I also had to be blown away by the sculpt. Based on those 2 simple rules I PO'd only Mags and Thanos. Phoenix was the only other piece I was interested in but I didn't pull the trigger in time. I can truly say Mags and Thanos are impressive statues. My jaw dropped when I unboxed both of them. IMO, the are magnificent pieces and I'm thrilled to have them in my collection.
I'd say if you are not a big Thanos fan, let the piece go. If you're not a truly impressed by the sculpt, let it go. However, if you really like Thanos as a character and think this is a great sculpt of him, keep the piece. This is one piece that I personally had to have in my collection.