[MrPapagiorgio]

I played another game where the bank worked like that. Choices were one week, two weeks, month, two months, three months. You were Also able to increase your long term interest rate by earning "merits." Unfortunately, Everyone playing this game discovered it was the easiest way to earn money. Hyperinflation. All of a sudden, everyone had the best house, the best weapon. Credits that had been selling for 40K spacebucks were selling for 10 million. The economy became so unbalanced that the ultimate result was a game reset in just under two years.

I am very much opposed to this idea as a result. You could probably make it work, but I don't think it's worth the chance.