What's the market these days for NOS 70's/80's cartridges and/or tonearms?

I have a NOS Shure V15-mk5mr in original box plus a NIB Jico replacement stylus. Wonder what these will be worth two decades from now? So far I have held off from using this V15! I have plenty of other cartridges on hand. Using the NOS Shure can only reduce its future monetary. value.

Original Blue Note jazz LPs now sell for hundreds! I can't afford those - and wouldn't pay those prices anyway! Anybody want to bid on my Andy Warhol banana sticker (intact) Velvet Underground LP. Record mint - looks never played. Cover (version 3) is EX (showing signs of minor aging). There are some now on Discogs listed at over $1K not as nice as mine!

Speaking of tonearms: I have a NIB Mayware Formula 4. Back in the Days of Yore (1977) I had the Australian JH copy  mounted on the Ariston RDII Superior TT with a Microacoustic 2002 electret cartridge. This was a particularly nice sounding set up! 

When writing my post for this thread, I probably should have been clear to indicate the purpose of my question was with a view to sell the NOS items I originally obtained for a second vinyl system project, but have now changed my mind.  At the same time, I didn't want to appear to "sneak in" items for sale via the question, so I just asked the general question regarding the current market for items such as I've mentioned.  Sorry if I've wasted anyone's time by the lack of clarity.   Yet, the feedback and responses thus far have been helpful, nonetheless.

What you got then?