Have you heard of the "fallacy fallacy"? The idea that calling out a fallacy merely invalidates the whole argument. Please explain how I have made the fallacy.
>to support the vast majority of society leeching off UBI
I'm not a proponent of UBI.
>At $1000 per month per American you're looking at well over $3,000,000,000,000 per year.
Although I'm not proposing that everyone be given $1000/mo (I'm arguing for Socialism, not charity!) the reason why you say it is so infeasible is firstly because (i) you regard $1000 as "basic income" (ii) you don't think this amount is already paid to the working class as a whole.
If the companies can collectively afford to pay people wages, then it would follow that an economy in which the companies have been replaced by a central organ would also be able to pay the same wages. $1000 is well below the median wage in the US (around $3100) which leads me to believe that Americans (by this I mean American workers) are are already collectively paid more than $3,000,000,000,000 per year. So why exactly is this number infeasible? It's already being paid, just by many entities instead of one.