Parts of the answer depends on your area. In some areas with larger properties, profits decrease when size increases. Focus on dollars per HR. If you get $50.00/HR doing smaller lawns(3-$20's plus drive time) then you wiould want to get the same or better doing larger ones. Most guys in my area are asking $35.00/acre. So to equal the smaller lawn prices, you would have to do apx. 1.25 of those per HR to get the same $$$. The only problem I see with that is if you have 4 days of rain and you get behind, which lawns are going to tie you up more, the 5,000 square foot ones, or the acre? What will you do with the tons of clippings? Double cutting an acre is a much bigger task than double cutting a 5,000.