If there are children figured into that 6,000 population (there are) then you would likely be trying to pull clients off the maybe 1,500 consumer base who would occasionally utilize coffee stands. Divided by 3... they had a potential base of possibly 500. Divided by 4 (unless you put someone out of business) gives a maximum expectancy of 375 loyal customers, pulled from the competition, most of whom would be occasional to the level of, maybe, weekly, maybe less. Some folks pull through twice a day but those are not a given potential base. Can your business survive on that? We have 5 coffee stands in the town I live in and they all do a good business pulling from a 32,000 population base.
You might be able to pull well over your share and even put a couple other stands out of business but it you have to go topless in order to do so... I think that's a very short-term plan! My guess is that it will backfire on you. But I don't know where you live. In my town, you'd likely be shut down before the first shift was over.
I'm just curious as to how a population of only 6,000 can already support 3 coffee stands. Minus kids, minus over 1/2 adults who don't drink coffee, minus the 1/3 of those who'd never go to a coffee stand..... you've got a very small base to build your business on. You'd need a very loyal one.... people who USED to be loyal to one of the existing stands.
Cool ideas might help. But so will looking realistically at statistics. How is the competition doing?