Colt Python back in the 70s was desirable and hard to find. They were also expensive at almost $400; a time when I bought a Colt Gold Cup 45 ACP for around $350.
I thought of buying one back then but was talked into getting a Smith model 27 by a shop owner who was also a Smith armorer and told me that the Pythons were notorious for going out of time and wearing out faster than the Smith. No regrets, and still have both.
The vented rib gave the Python that cool factor, and I believe the buyers today of a vintage Python are the shooters who couldn't buy one back then because of cost or availability and can spend a good deal of money on one because they are in a better financial position to do so.