In one system here there is a VPI that started off as a junior. Over the years it has finally been upgraded as far as possible sans the SAMA. The Superplatter was a huge upgrade for this unit. Also the SME V arm was huge as well.
How often do you upgrade turntable ?
The table itself, not arm or cartridge.
And when you do, how far do you go ? Big steps, small steps ?
I got my Nottingham Spacedeck more than ten years ago and have no intention to replace it. I would have to jump high for the upgrade to make sense. One day perhaps.