BI is almost exactly the opposite of a lottery. It isn't a sudden mass windfall, but instead, a steady trickle which, if spent appropriately, enables a secure existance.

There's the question of whether or not it will be spent appropriately, which raises the prospect of whether or not there are a class of people whose economic decisions ought be made for them. Or rather, what additional classes of people exist meeting that criterion, as we already hold that children, the senile, and various handicapped individuals cannot see after their own affairs.