they could increase the number of beehives by a factor of ten?
Clearly you are not a beekeeper. I am. There are many limiting factors in increasing the number of hives maintained. The shear amount of work and time it takes you to maintain the hives becomes unmanageable. Hiring employees isn't as easy as it is with other profession, for some reason lots of people won't take a job where they wear a sealed up thick hot suit in the blazing sun all day because its the better choice than getting stung by the insects you are working with.
You also need the physical space for the hives in a place where there is enough forage for the bees to feed on. Increasing by a factor of 10 isn't just adding 10 new hives to one location for every one already there, its finding new sites in rural areas a significant distance from the sites you already have (bees typically fly up to 3 miles). Having new sites vastly increases the amount of time it takes to maintain the hives since a lot of travel time is added in addition to the extra management. While backyard beekeepers can keep a few hives and no one notices, 10+ in a single location means you need to start looking for places with acreage isolated from the public.
On top of that the equipment has to purchased, built, painted and carted to the new areas (you can hire for this part thankfully). The existing hives have to be split in a responsible manner that leaves the parent hive strong enough to survive, getting 3-4 new hives out of 1 every year is more than is usually practical 10 is ridiculous. Doing one split in spring (going from 1 hive to 2) is common, maybe a second split in late spring or fall if the hive is strong.
Then you have to add in the winter losses. Losing 25%-30% of your hives over winter is not uncommon or too far out of the norm. The more you split the weaker the hives will be and the fewer that might make it through the winter.
Once you have planned out all that you need the money to do it. Having a few hives for a hobby is nice, having dozens if not hundreds is a business. In order to support the capital investment in equipment, workers and bees you need pollination contracts (thats what makes beekeepers money, honey is a sideline). Which means you need farmers planting crops that they need bees to pollinate. Of the top crops in America (Corn, Soybeans, Hay, Wheat, Cotton