Vaporize vs. atomize?
The manufacturers make tradeoffs to sell lawnmowers.
Long runtime may not be one of them.
If it does work, is it worth it in the grand scheme of things?
If the lawnmower makers view this as a serious threat to their business they may buy you out. If that doesn't work they will send thugs.
Or they may patent it and then accuse the original inventor of infringing on their patent, because, after all, here in the US we are civilized!