Ogilvy may be right, but it's not easy being high-tech homeless. Ordinary transactions become very complicated. This is harder than it sounds. A key decision is which two nights you spend in the same place to get the washing done. One consultant views it as utterly unremarkable that he sometimes has his shirts sent to his next location by Federal Express.
Many nomads have their bills routed to their accountants or lawyers.
Electronic banking has helped. If you're Bryan Rich, you never use credit cards, only debit cards, and make sure you periodically wire enough cash to those accounts to cover your expenses. Nomads travel light, both literally and metaphorically. This turns out to be the argument for keeping apartments, somewhere. They are cargo dumps with a view.