I will keep records of my mails, and will back them up in a flash drive just to make sure. They'll all be kept in an excel file, with the amount deposited, the date of deposit, and username on it.
I am fairly confident that I will be able to return the investments. If not, I have 400 dollars to back it up by buying CE if another update screws us all over.
Also, I'm confident that the deposits from the permanent quitters would be enough to back up everybody's deposits for at least half a year. Additionally, if they ever remove the no-trading policy for alchemized items, I will be able to turn a HUGE profit every day just from UV'd items.
Interesting. How is your record-keeping planned? And how confident are you in your ability to return on everyone's investments if, say, a ton of people invested?