Use your milker again and again inside any building, restoring your Energy as necessary with Medicines or food until you reach Level 1 with the Milker, then use it 99 more times in quick succession in order to be able to obtain 99 bottles of milk each time you milk your cow. Not only will this increase your income enormously, but shipping the milk will rescue a number of Sprites!
In both later U.S. versions of the game as well as the U.K. version, the Ranch Bonus has been removed. Moreover, the level of both milker and clippers will increase very slowly. You no longer can go from Level 1 - Level 100 in 99 uses.
One should pass their milk through the cheese maker to greatly increase their gold. By having 4 cows, and getting 100 milk from each one per day, and converting all that milk to cheese, you will amass over 100,000 gold per day!