It was a very good idea, and was a very popular feature. Namepros had a bank. You could buy for .02 cents and sell for .007
It would fluctuate. You could sell domains for np$ then use np$ to buy likes for facebook page, or youtube channel. You could buy charity ribbons and donate it to people. You could sell it for money. They killed the bank about 6 years ago, it was huge part of namepros when it was active