This is how you make a living now. I'd worry that they are saving for retirement and have enough set aside for good benefits. There is a sameness to their videos but it works so keep doing it. That's really true of all YT channels. This is the new reality TV of today.
John is a good player and Ashley has gotten much better as the channel has grown. They tend to drift towards major brands and have left some gold mines at thrift stores. Imagine their eBay/IRS issues come tax time. But I'm sure they have that covered. I'd suppose they have cut off a lot of eBay or Mercari sales and just make money off the YT algorithm 21,119,513 views as of this morning since Nov. 2018 is nothing to sneeze at.