One can get a distorted sense of the relative size of espresso machine manufacturers from looking at the North American prosumer market, or even the North American market in total. There are a few vids of factories on YouTube - Simonelli's is by far the largest that I have watched.

From the European Coffee Trip folks (the ones that did those excellent videos of Gwylim Davies earlier this year)

this video give me an good impression of one of the big italian espresso companies. ( 25.000 machines/year)
Thanks for sharing.