$$Get larger payouts from visiting more neighborhood houses$$
The more houses you visit back-to-back, the larger the payout. At first, tapping a friend's house might give you only about 3XP and $17... After visiting maybe 16-or-so neighborhoods (3 houses each), you'll start collecting stacks of cash worth $50... and more with each additional tap. It keeps going up and your only limit seems to be the number of friends you have. BUT!!... if you stop to take a break and return to visiting neighborhoods later, you'll notice that the payout will be reset to a lower amount.
So what are you waiting for?? Add me (patthepotato) and visit my neighborhood!!
We have more cheats and tips for this game here, The Simpsons: Tapped Out cheats
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