I turn down clients all the time because they want it cut to the dirt. I cut fescue at 3.5 inches this time of the year and 4 inches during dry summer months. I will cut down to 2.5 when over seeding but in increments. I don't take bi-weekly lawns because especially this time of the year my weekly properties (high end residential well fertilized, taken care of fescue lawns) are high that I almost need to bag so imagine if I cut every other week.
I tell them to find someone else to cut it to the dirt bi-weekly. When gaining a new client I always tell them my cutting heights and explain the benefits and if they mention its too high and want it cut shorter they can find someone else.