Some of it is because the Evo line sounds measurably better. I tried the Dialogue Premium and Evo 400 at home and the Evo line was indeed more than a shade better. A lot of smart little details have been added.
I have also wanted to trade up. But as I have upgraded my speakers, phono stage and cartridge, the Primaluna has seemed to prefer the better gear. Currently the weak link is probably the Primaluna. But the sonic presentation is blissful.
Can I get better, yes. But I want to hang out here for a while before I move on.