That’s fair enough I would upgrade myself except for three reasons:
1. My computer is old and dying and struggles at a crawl with 4.0, i don’t it would handle anything more advanced.
2.I remember reading that there are one or two features I use regularly in 4.0 that aren’t in more advanced versions (can’t remember what they are at the moment).
3. I’ve also read about some people having all sorts of content problems when upgrading (stuff vanishing and so on) and I haven’t got the patience for messing about.
I’m more than happy with using DS 4.0 on a basic level. it’s annoying when companies preclude people from enjoying things by basically saying “upgrade or you’re out!”.