>> I'm someone in the business
Selling stuff on eBay, unless it were your full-time documented job,
doesn't put you "in the business". Frankly, there is no "the
business"
of vintage computing. Other than a handful of professional museums and a
handful of kits/parts makers, how many people make their living from
vintage computing? Even with Sellam it's only part of his business in
addition to electronics recycling and consulting.