There are all kinds of little costs that eat up your profit. I had someone from the Dept of Agriculture stroll in my distillery one day, the end result was that I needed to have a license from them, even though we didn't produce a food product, and I would never see them again. The license is $380 a year and they do not prorate, so I have to pay $380 in March and $380 again in June. Sure that's only $380 a year but the little things add up.
Play music in your tasting room? Someone from BMI or the other artist rep companies will eventually come in a demand a license. Luckily thru DMX you can license for all three agencies for $25 a month, instead of the $25 per license per company that they will try to stick you with. The list goes on and on.