I'm sure it said give you £100k and everyone else £200k. Admittedly there is already money in the system so money in the bank would be different. Maybe I misread the question (I'm on my phone so can't be bothered to fine the original quote) but basically £200k to everyone, where is that coming from? You've basically created billions of pounds overnight. Even if it was redistributed to the "poor" from the rich you would still have a huge increase of ready money, essentially put back I to the system. You really think shops wouldn't put up prices if millions went on a spending spree?
It's a far more complex question that it appears IMO, especially as we don't k ow how it was properly worded. So no, it doesn't have to be entirely about greed...