What Bill said -- no means testing, anyone who wants to apply for the Basic Living Stipend gets it, period. Yes, that means that some greedy people will apply for it even if they "don't need it," but you're postulating a society which can afford that. It is definitely NOT ethical to leave them to starve in the gutter, because Civilized People Don't Do That.

I will also point out that being a total lazy layabout takes considerable effort, and that sooner or later a fair number of these people will be bored out of their gourds and start doing something to occupy their minds.