The word "tip" stands for "to insure promptness." So when should you give it? Up front,of course. Sophisticated people don't take chances on poor service, they insure good service.
Jim RohnJames Allen says 'We curse the effect and nourish the cause.' The guy puts sand in his shoes and he can hardly walk and you ask why would you do that? Why would we wish for it to change, hope for it to change, but all the while resisting change?
Jim Rohn