They would still be using a lot of city/state/country local infrastructures (utilities, roads, parks, emergency medical/police/fire services, local libraries, to name a few), won't they? Costs for these might not be funded by Sales Taxes alone or at all. Not paying one's dues to the City/State/Country of residence in accordance with local laws is not only illegal, but also immoral; it breaks revenue calculations city/state/country makes based on multitude of things (at least in most sane places), and if a nomad is not doing not paying equal share, then the locals are footing the bill for them! Mere income tax on landlord's rental income is not something that will come close at covering all the income gaps city/state would face if one were authorized local worker. As someone else pointed out, these nomads are earning in foreign currency that literally translate to 10x-100x in local currencies, they will simply drive the prices up and soon drive them up enough out of reach of the locals simply because nomads can afford inflated prices.