Man, I love Colt revolvers, but I've never understood the big deal with the Boa. I understand that there wasn't many made, but it's really not that great of a gun. Essentially, it's a King Cobra with a vent rib, and nice polish job.
The MK5 is a good revolver, but it (starting with the MKIII) was Colt's step down from the hand fit, beautiful action of the E/I frames with the leaf mainspring. Those guns are a work of art. The MK5 series was a good, work horse of a gun. The Boa was just a dressed up Chevy Impala. Not like an early Python, or even a later classic Python. Heck, from just a 'gun' standpoint, I'd much, much rather have a Colt 3-5-7, or original Trooper, than a Boa.
I suppose scarcity always commands value in the market, and condition is king. I just never saw that gun as something to be desired to begin with.
As we all know, there are people that have so much money that $30k+ is a drop in the bucket. Heck, if I was loaded with that kind of wealth, I'd probably grab one as an investment... But I'm not, so I'm resigned to sitting back and shaking my head in disbelief that someone would spend that much on that kind of gun.