Hi everyone. Say you get 100 people to each give you R700, that's R70 000, right? Say you then hit a snag, and you have to do some refunds. So you keep back funds for the period when a sim card was working (which may have been free wifi from the service provider anyway) and work out a pro rata rate for the rest of the period. Say you keep R300 and return R400 x 100. You're still sitting with a cool R30 000! And you get to gloat about what a good person you are for having refunded your customers.
Nice job if you can get it.