Exactly right-I used to change at least once a year, but that was before I had two teenagers in school! Still, if you change while the current keyboard is still worth something it helps a lot. You can depreciate a keyboard in one year now.
Also the higher-end users tend to circulate some of our keyboards amoung ourselves and this can be economical for all concerned.
I have either bought or sold keyboards with five or six of the forum members.
Only problem I ever had was forgetting to enclose a power cord with the PA80. I sent it separately and it got lost or delayed so I bought another and sent it too.
DonM