With the 1.6 gallon law,
I'm curious as to why we don' see high, wall-mounted tanks.

Ok, installation would be a little bit more involved and therefore expensive, and
servicing the fill valve would be a bit more difficult.
Anything else against it?

Seems like this would work well on a low-pressure system,
be fairly simple, quiet, and give some extra flush power compared to a low-mounted tank.

I know there are a few high-dollar renovator models available;
are there any reasonably priced models?

Good health, Weogo