You can get someone to keep your garden under control for less than I charge, some people I know only charge £10 an hour, I'm having to factor in 4 months of no work due to winter. if I could work through winter I would lower my prices.
The great thing about this business is working for your self, and no one over your shoulder, if you do a good job they have you back, if you don't they don't tell their friends, that means a loss in money.
I like to treat every customer the same, but sometimes you find favoring certain ones, It could be just me been a soft touch. :D