If you go into a salon and it seems shady, leave. If they are doing something to you you don't approve of, and they insist they continue, leave. If the salon is dirty, or the technician is rude, leave. You shouldn't have to put up with being mis-treated and then have to pay them too!
The bottom line is if you're going to a salon where the technicians use products that aren't good, and they aren't licensed, you could leave with all sorts of problems! Choose your salon carefully, and ask to see a copy of their license. Don't be afraid to ask them questions. Any licensed nail technician shouldn't have a problem explaining what they are doing and why.