Years ago, I heard and fell in love with Martin Logan Monolith IIIx, active xover, two amps, lots of wire, cost a fortune, amazing speakers... bought them, and within a year, replaced them with Vandersteen 3As. Much better.
The problem was my room.
(Sold the Monoliths to a buyer in Japan and actually made money, so it's all good.)
I think it comes down to your order of preference: less expensive speaker can do some things spectacularly well (I love the Revel M106) and if that's what floats your boat, might as well stop there. But some, not all, more expensive speakers do many things well, and... can float more boats? Float bigger boats? I'm lost...
Good luck!
I heard the Radialstrahler System Xtreme in a good demo once... breathtaking. Truly breathtaking. $250,000 was a little high for me at the time (ya think?). But I heard the incredible sonics and could see the engineering and expense. Well done, MBL. Clearly they represent value for (an incredible amount of) money.
Chacon a son gout! And happy listening.