"Let me also state that, residing in a European city, I do tip my (cheap) barber every time I go because I feel they do an outstanding job at 20% less the price than most competitors, and that work deserves praise in the form of a tip."
Do you also tip your local bike shop or computer store when they sell you a computer or bike that is outstanding and costs 20% less than most competitors? Do you tip your car salesman? Do you tip your bus driver when he/she is 20% faster?
I might tip a bike or computer shop for doing a superb job at repairs. Hell, if I were to hire a person to build a computer for me I might tip them if they did an exceptional job. Tips are for services (like a barber provides), not products (like computers, bikes, or cars).
Tipping in the example circumstances I gave isn't typical, but it's something I would consider doing in exceptional circumstances.
Do you also tip your local bike shop or computer store when they sell you a computer or bike that is outstanding and costs 20% less than most competitors? Do you tip your car salesman? Do you tip your bus driver when he/she is 20% faster?