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Depends on where you live. If you can find a large enough building and renovate maybe. A pre existing building with all the machines already there would likely cost much more.
Running a business isnt really simple though. Lots of things to take into account. Taxes, overhead, inventory, maintenance, customer service, and thats just off the top of my head.
A lot of those business concerns are minimized with laundromats. Inventory is as simple as it gets. You provide coins and detergent. There usuall isn't much for customer service either. The biggest thing is having the captial to pay for stuff that comes up like repairs. A lot of the other minor problems can be outsourced for relatively cheap like bookkeeping and cleaning.
A lot where I used to live ran small convenience stores within the laundromat during the day to make a little more money. Depends how much foot traffic they get to make that worth the effort I'm sure.
Then there is the water. Nobody thinks of the water.
yep, inventory management is a nightmare.
you can't be known as the laundromat that runs out of water, but you can't overstock or it will go stale, and then disposing of it is no simple matter
I live in a very wet area so I may be biased but water is very cheap as far as an operating costs goes.
Edit: also if you want to be a successful running a laundromat the water costs should be worked into your pricing so the cost of water is really a moot point. Its like saying the cost of eggs will bankrupt a groccery store, except a laundromat won't be using any water a customer didn't pay for unlike a store which might over order eggs.