The Zed isnt the be all and end all y'know.
Some people just fancy a change. S2000 and Rx8's are both decent cars, and not cars I would view as a downgrade. More just a sidestep for something different.
As much as I didn't get on with my old 8 I've got to say they're a whole lot of Rosie for the money these days...........if you were trying to free up a bit of cash and keep the fun there are worse ways.
...........having said that personally I'd rather set fire to my pubes