Yeah, some will say he makes a good bit from YT (and cameo), but I don't think he makes that huge amount of dough. And now that's for both of them and they have the costs of doing the trips. He's tight unless it's something he wants or wants to do. Aside from the occasional video, his views are OK, but not great. I see some channels that regularly get more views who have other jobs in addition to YT.
I feel like one or both of their parents have helped them either in purchasing the house or some other way. With both versions of the shed museum, the work that was decent on them seemed to be from his dad.