I know one club in the South of the UK who lease hangar space to a local UK maintenance organisation that then charges thema fortune for crap maintenence. The club could take control of it's own maintenance and that of many local owners and do a far better job of it than at present. Of course employing people from a country with a highly skilled and well established aircraft design and production industry always makes sense.....but that does not describe the UK anymore unfortunately.
A club with a reasonable number of aircraft is a different matter.
Aircraft out of service cost money - and the best time to do some of the work is after hours.
However, the capital cost of setting up such an organisation is significant.
Schools find it almost impossible to make money anyway, unless they are involved in commercial training - and there are very few of them.
I dont suppose you will find many going into this business without some history these days, or if they do, they dont last long, which says something about the industry.
Now what would make senses is a structured system of continous maintenace - but that would be far too simple.