Why do some model names use "MKII"?

Or happy MKI owners will have a chance to be happier, where they might otherwise just stick with what they already have.

I think that many do pursue the ceaseless pursuit of improvement, sometimes parts become unavailable and new one's must be used. However, I do think that the basics of great preamp and amps design is pretty well figured out and has been for many years, though there have been some improvements in passive parts. So yes, there is a quest for improvement, but there also is a very power marketing reason for new models on the showroom floor.

Merovech.

After MKII, sure to follow will be Ultimate, Special Edition,
Signature Edition, Reference Signature, and finally Master
Reference Signature Edition MKII followed by the new MKIII.

I do trust products that are well sorted overtime by gradual evolution of an original idea that was good to begin with (CAT SL1, Merlin VSM, Atma M60s, Vandersteen 3A) for example, rather than product lines that change dramtically every 3-4 years, claiming new technlogy or circuit breakthroughs. The "evolvers" tend to have gotten it right the first time in the basic conception, and slowly over time there are real imporvments in passive parts that lead to refinement of the original, as opposed to a wholesale rethinking. I never though about that much, but the products that I own and have most enjoyed are coincetantlly those that sort themselves through time with minor improvemnts to the original.