They say boring businesses can be highly profitable, though! That's surely not the case for all the businesses on this list.

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1. Printing business
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HOW do these still exist? I'm not sure what they're called exactly. The places where you can go and ask them to print one page. I have occasionally done this and it cost me like 5 cents, maybe 20 cents, can't remember. In Belgium and Italy. I assume they have much larger orders as well, but the fact that they bother for just one page baffles me. And it always looks so depressing inside. Often messy. Printers and papers all over. It's horrible.