Excellent point. However it should also be noted that you are insane and have a hell of a lot of tubes
Just to go with your idea, I have 2 pairs of Mullard 6922s, 2 pairs of Mullard 7308s, 2 pairs of Amprex 6922 PQs, a matched quad of Amprex 7308 PQs, and a pair of Phillips SQs from the Amprex factory, all authentic and verified, all NOS. Factor in the additional six or seven pairs in my equipment and rolling rotation (all of the above, later production Seimens-Rohre, 70s Russians, JANs) that are obviously no longer NOS, the box of tubes that came with my equipment that I didn't like but inexplicably kept, and my quad of Valvos that aren't rebranded anything and sound like crap and I've got enough tubes to last me the life of my components (or at least untill I'm married, have kids, and need to downsize the system). As you and I have discussed on #headfi (shameless plug) the cost of NOS in this family is crazy and it's not getting any better. It could be said that the ownership of such tubes is an investment... I'm fairly sure that if I decided to sell them now I'd get more than I paid for them. That said I'll never get rid of them unless they're included with a sale of my current tubed equipment.
Of course, this family is a bad example since it's one of (if not the) best examples of supply not matching demand. Also, I have yet to hear a current production variant that I like, and that includes the Teslas.
Actually I wouldn't be surprised at all. Note the *most* and that it's obvious musicians are what drive current production. Still, most wannabe guitar gods I know hardly get enough money from gigs to survive, let alone retube the input and power stages of their amps. While I am impressed with modern tubes in some families, I still don't think most compare with good vintage. I've been in this hobby long enough that I'm not going to hold my breath for change. By the collection of tubes in your avatar I suspect you know what I'm talking about.
For what its worth I don't like any of the Sovtek signal tubes but their el34s have surprised me. Also, since the tube is so common in hifi and guitar amps, readily available, and therefore low cost I doubt you'll have any problem retubing your amp.
Right with you man.