[vizeroth]

There's a significant gap between the bottom end of people with other sources of income and those who will "accumulate it with no intent to spend it". Further, even if you give it to everyone across the board, most of the people who don't need it for basic expenditures and have no intention of saving for a big purchase at some point in the future (e.g. a down-payment on a car or house) would likely be making enough money that the UBI is less than their taxes.