When selling lime finishes professionally. It is important to emphasise that you are recovering the breathability of the wall. There is an inexpensive ($400?) sandblaster which blasts and vacuums at the same time. Not industrial quality, but enough to remove layers of latex, wallpaper, alkyds. The number one household insurance claim in the USA is over mold, water vapor must be able to flow. An annual lime wash kills molds, bacterias, and probably viruses too - and the whole room smells fresh and clean (unlike other paints)
The second, especially on outside work, is to emphasise that lime finish 'patinates' rather than completely fails. The latexes and alkyds look new - and then fail spectacularly. The lime finishes wear in like an old pair of blue jeans - and some people actually prefer that look
Lime finishes are for those with distinguished tastes, but a good pool of clients should keep you, and your kids, busy for a long time.