I dunno, but my guess is they don’t want to tick off their contractor customers by selling to the general public. I recently needed to replace the blower motor on my furnace. I found a place online that could get it to me in a couple days. I went to a couple of HVAC distributors, hoping to find one in stock. Neither of them did, and both of them asked me if I was a contractor, and told me no. The second one, I told him “Fine, I’ll buy it online then.” He replied “That’s great!”, like he didn’t care. I realize I’m probably a one-time sale. But why turn away a $200 sale? Especially nowadays where the internet will sell anything to anybody, as long as its legal.I'm learning that.. need to be a contractor. Why does it matter contractor or not. Weird. Why limit your customer to only contractor? Contractor buy more but why boycott everyday handyman?