Very odd that the seller, apart from the Leia, just happened to be selling the 3 of the rarest POTF figures. Something doesn't make sense.
In regards to selling them, my advice is to watch those bubbles if posting. My ROTJ Nikto had a yellowed bubble, and probably with the help of the horn on his helmet, broke out of the bubble in transit, meaning I had to give a full refund. No problem on a £50 figure, but will be gutting on one worth thousands. Make sure the bubbles are well packed. Suggestions on here have been a rubber band that JUST fits round it with very little pressure, then maybe some cut foam, on top of that, bubble wrap and/or packing nuts.