Your desire for numbers is understandable, the problem is there is no easy answer without a lot more information and even then every location is different. For instance, one blue collar location might be isolated with few choices for food etc... while another may be near a McDonalds and your sales suffer because of that. There are lots of other factors so as much as many of us would like to give you an answer, it really is a shot in the dark. If you want to get specific then mabee we can give it a shot. For instance, you say blue collar, do they have air conditioning, are they close to any fast food or convenience store locations, do they have a lunch room or just fend for themselves, do they have bottled water provided or ice provided. You get the idea, so if you want to try and be more specific I will see if I can give you an idea.
Like Scott said there are may variables. I think that before we have kicked around that $2 a week for white collar and $4 a week per blue collar were fairly accurate numbers, but I have had locations that did not fall into this.
Using your example above you would get ~$400 a week from that location, but a location is never 100% blue collar due to office people that usually work in the front.
What you offer to different size accounts vary somewhat by region. Around here if you provide a food machine then it is kind of expected that you provide condiments and a microwave. Any location over 100 employees you will probably have to do cold food. The amount of machines will depend alot on the layout of the business. Can you have one main vending area for the site with other drink machines scattered about, or do you need two vending areas because thay have two buildings on opposite side of the road?
I don't worry too much about how much equipment they want (or need). I worry more about how much the equipment will cost me as a whole. What kind of equipment you use will be based on the location there standards and what they have now. Can you get away with used, or refubs. I would much rather buy two $750 refurbed drink machines then one new $3500 drink machine. Evauluate your total investment to aquire the location vs the expected income.
With that said, I am just now getting into these larger locations. Most of my locations are not "traditional" manufacturing type locations.
JD