Those fly by night businesses

In North America usually people involved in the Fly By Night Scheme like to make quick cash without doing a good job. 

It's usually those who you see put new roofs on, windows, doors, and seal your drive-way. They have no real business name, no reputation, and don't have any warranty since when you try to reach them, they flew away never to be seen again! 

In Eastern Europe, it's usually those people who make new balcony's for people. Usually you find their advertisement from people who hand out small flyers to strangers on the street. Again, they have no name, no reputation, and do not guarantee their workmanship.

The name fly by night comes exactly from the name itself. How do people find fly by night businesses. They find them easily because they do job cheaper than their competition. Hence, you get what you pay for!