Demand is often a chicken-and-egg problem. Having the capacity available will go a long way to creating the demand. There are plenty of incredibly wealthy people who could be persuaded to build the first moonbase, space hotel, low-gravity manufacturing plant, manned Earth observatory ... and a practically endless list of things we've not thought up yet ... but they can't do those things now because even if they paid the money there just isn't the launch capacity to do it. Putting the capacity in place fixes that problem and frees those people to start spending.