These are cartridges I collected during my days in the business. They are good enough that I don't need to jump on new stuff.
The Adcom, AT and Ortofon were bought new, the 23R came in the purchase of the TD-160 Super/Musical Fidelity AC-1/Magnepan Unitrac (in 1986) and the Koetsu came with the purchase of the KD-600/Fidelity Research a few years ago.
Would I like new, sure, will it be better, not for less than a grand. These cartridges all together were cheap but I have taken care of them and limited the wear. This latter issue, the wear, is to be determined as the local shop now has a microscope to check them out.
The Benz owner tried a newer cartridge and preferred the old MC-20 and got one. Then an MC-30 showed up locally and he grabbed that.
I guess it is value for the money not going for all newer equipment.
Anyone wanting a newer high end cartridge auditioned send it to me. There are a few folks here that would like to hear it.