I do all maintenance except fert because i don't have the license. Almost all of my customers have me do everything, but I usually charge as I go instead of giving them a price a the beginning of the season.
It is definitely something for me to think about and it would be more nice on a couple of my elderly clients if I space out the payments evenly that way instead of paying me $100 in August for mowing and then $250 in September. The price could be $150 all Summer when not much work is needed and the price doesn't change for Spring and Fall maintenance.
There is an Old Blue Chair for each and every one of us, we just have to find it.
2006 GMC Sierra 2500hd crew cab
BOSS 8'2" Power V
Hustler X-one 60"
Toro Proline 36" wb w/t-bar controls
JS46 22" walk-behind (wouldn't recommend)
Shindaiwa T254, Echo trimmers, chainsaws, pole hedge trimmer, pole saw, hedge trimmer
Shindaiwa 633 and Husqvarna 130BT blower