I think, going for vintage Turntables has several reason's:
Price, lot of people out there can't afford the actual units or when they do a comparison, some may find, that the actual units are way overpriced for their performance. Same for Tonearms and cartridges.
But, this is NOT a general rule, Audiofeil wrote good lines about that. Most of vintage I wouldn't even touch, but when the search is done right, you can get an impressing result.
I bought old Micro Seiki, made some improvements with some Know How from today, linked it with a 30 year old Tonearm and a revisited jap. Cartridge and the result is stunning. Really stunning. I listened to endless actual units which aren't even close.