chris b , whilst i bow to your much better knoweledge in these matters i would never suggest to anyone other than your self the idea you based your ideals on the 80lb per hive mark, 30 is never to average. the other thing with the 15kilo level is that the first questioner did not say if he was placing 50 or 100 hives in one spot or many others.
i did love your break down of costs they seem very tight to me but i dont know as i have only ever helped pro. beekeers i have never been one.
the only person i got very close to in wales was working a 6 day week and his wife was permantly working the barn, either extracting honey, sorting wax and propolis or mending/making hive parts from plain sawn timber. making them selves self sufficiant in timber and parts, but he was also doing some serious miles shifting hives from crop to crops and i would suggest that his profit line has changed completly because of the costs of fuel to do so.
as for fertilation of fruit trees, i have only ever heard of that in a few of the very very many farms around the vale of evesham and the cider apple farms around ross on wye. i did not realise it was possible to make money doing that in the uk at a low level.
i also missed out on the fact that a extractor capable of dealing with 50 hives and a possible 150 supers would realy be into the thousands rather than hundreds. and at sort of level some form of food grade area to work in would realy be wanted, be it a portacabin or a converted shed/barn.
the main point i was trying to make that as a beginer the idea of springing up with 50 hives and making money is very very hard to do, but in a light hearted way.
i know what it takes as i have tried twice in the last decade to get into commercial ways but failed mainly due to the start up costs of the frames and foundation. £2,000 was my share in the last set up. and that was frames only , the details are logged onto the forum for others to see,