Kwik-E-Mart Farming.

"Bomb319;d-113965" wrote:
One last thing - you're supposed to wait for the KEMs to build, then sell them immediately without waiting, right?

Well, you do have to tap them to complete the build. But yeah, you build, tap, sell, build more.
To figure out how much money you're making each day just write down the how much cash at the end of the day (just before closing the game and going to bed), then do it again at the end of the next day - without having bought anything that day. Otherwise it will be complicated.
To build 35 KEMs every 4 hours in my Freemium game I need $878,140 per day.
Never spend all your money. Figure out how much you need for the day and never spend below that amount.
The following list is the buy and sell prices for KEMs starting with KEM #2 (you can't sell the #1):
#02 - $220 / $55
#03 - $260 / $65
#04 - $300 / $75
#05 - $380 / $95
#06 - $450 / $112
#07 - $580 / $145
#08 - $680 / $170
#09 - $800 / $200
#10 - $900 / $225
#11 - $1100 / $275
#12 - $1300 / $325
#13 - $1500 / $375
#14 - $1800 / $450
#15 - $2200 / $550
#16 - $2500 / $625
#17 - $3000 / $750
#18 - $3600 / $900
#19 - $4300 / $1075
#20 - $5100 / $1275
#21 - $6100 / $1525
#22 - $7300 / $1825
#23 - $8700 / $2175
#24 - $10300 / $2575
#25 - $12400 / $3100
#26 - $14400 / $3600
The payout on Pink houses is terrible. You're better off selling them and buying Blue or White. Blue pay more but you have to tap them 3 times a day to get maximum payout. White only have to be tapped twice a day. I have Blue house farms in my 2 Premium games and White in my Fremium. Having White means I could set my characters on 12 hour tasks and go to bed without losing so much income for the day. I'm thinking about selling off my Blue houses in the other games and replacing them with White.
Purple houses pay out the best, but you have to be able to tap them every 3 hours - not great if you have work, school, or a life in general.