Right so where does the money come from for paid help? And who are these mythical people who can put in these hours? Are they going to be people who have other jobs? Or teenagers who have very little skills to offer?
And as you point out, how do you fund that on top of new building stock? Just at the time when scouting UK got stuffed by last year's jamboree and will be forced to sell off assets? (Which won't be local buildings because they are owned by local groups not scouting UK).
And at the same time this whole conversation is about keeping it accessable to those struggling financially the most... Which if you add in the costs of hiring an employee (wages and NI etc) just makes it more expensive.
Your post is incoherent in its consistency.
Our group successfully raised money for a new building. It involved a lot of fundraising, imagination and making the most of grants and asking businesses for donations. So it's doable. The building was financially viable - then COVID hit and it caused issues. Then the cost of heating the building hit and lots of groups using the building folded because people are struggling to avoid to go to other activities groups. It has to be run like a business in it's own right which isn't easy - it can't afford to support a paid employee. That's in addition to Scouting. So in some respects there's a lot to be said for groups to hire third party buildings so they don't have that additional work.
In terms of leaders and how many hours a week they work, I know several leaders who do / did 60 hours a week plus and still did Scouts AND something else. So I think that's a point that doesn't really stand up either. It's definitely down to mindset not the amount of time people have.
I really do not think there is an alternative model that allows scouting to remain the characteristic of being cheap. It can't carry on without volunteers.