I found Imbroglio's comment @ 15.10 persuasive. Otherwise he gets nothing out of ruining the business other than the perverse satiafaction of gaslighting hellin.
Turning it into a 'proper' business satisfies his need to be right & allows him to rescue the farm, Peggy admires his business sense, Patbot & Tony are useless and wrong & most of all retired so can't get in his way, Henwy's at Boarding School & Tom - well, Tom better watch out cos Organic (said with a snort of derision) has no place in the real world, does it, darling? May as well take your fancy ideas over to Canada. (Johnny will be long gone in his masterplan & Hellin consigned to whatever he'll is deemed suitable, so long as she doesn't get in the way of Knob's proper bring up of SOK, with Arsula & shadow-Dad.
And breathe....