Huye Hombre Huye by Xosé Tarrío González is a pretty good first hand account of someone who might be considered a more current illegalist, though idk if he'd have used the label.Jules - Part of your question might be answered by looking at a person who shares your moniker, Jules Bonnot and the gang. A lot of their takings went to fund other anarchist activities. Of course, they were able to be lifelong illegalists because they all died fighting the state...edited to spell the title of the book that is over my right shoulder correctly - thanks, dot! :)
I don't know a bunch, but as I understand it, some of their money funded l'Anarchie which was an individualist periodical.