The ability to transfer cards or in game cash between players would change the game. Imagine being able to buy a million dollars on ebay for $10 USD. For a starting player that would be a huge boost right out of the gate. Imagine dollar farmers in China with fields of brown houses tapping away every five minutes. Great book with a similar concept is Reamde by Neal Stephenson. I bet the devs never let this happen.
It'd be great for special events where you might have a surplus of Goo or Coins you want to give out. Or even instances where you've been given multiples of the same item. I can't imagine it would ever happen though because it would be easy to manipulate.
It would be nice to be able to do more with your neighbors aside from just tapping their buildings though.
A Springfield bank with the option to transfer currency would be cool. Also keep a set amount stored so you don't spend it on accident. Being able to send mail if your neighbors have the post office would be nice too.
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It would be nice to be able to do more with your neighbors aside from just tapping their buildings though.
I agree more neighbor interaction would be neat.