Not much of a hobbyist in the sense that he earns (part of) his income from dabbling with RPis. And for the rest of his income, uses them to simulate larger clu

Not much of a hobbyist in the sense that he earns (part of) his income from dabbling with RPis. And for the rest of his income, uses them to simulate larger clusters, which he writes books and consults about. Generally, hobbies are activities where one sees loss not profit.