I see... and you did well... it is a reference for a novel and interesting idea.
The problem is in the marketing.
For example, most ordinary consumers don't have the knowledge to distinguish between different types. One uses to ask:
What is its input range?
If our answer is 180 to 260V... we will hear him saying: Too bad, I heard of a better one with a range between 145V to 260V.
What is its power and price?
If our answer is 10 KVA for $180... we will likely hear: Oh... I heard that 10KVA price for a wider input is $150 at most.
Naturally we will clarify that the ouput varies only betwwen 217.5 to 222.5 only. I won't be surprised that the answer would be: What I understand is that my appliances run fine so it doesn't matter if the output regulation is +/- 1% or +/- 10%, why paying more for something not too important.
Also, talking about efficiency will end up to the same remark since its effects cannot be observed easily and in a short time.
In a previous post, I pointed out that when I built (long ago) a stabilizer using triacs (to get better regulation and long life) I couldn't sell more than a few units of it (in fact I designed it mainly for my house). But when I produced the cheaper model (using relays), its sales helped me buy the first car just after a few months! The irony is that I spent more than 6 months in the design and test of the triac model while it took me just one week for the relay type. :grin: