easy boys. lol
I would make (and have made) the same assumption Turdle did. These headers are inexpensive. So inexpensive that the cost of quality metal out weights the cost of the headers. Assuming that the labour to weld these up is almost free, there would still be a negative profit.
In a market place, I think we would all agree that you have to make a profit on something you sell.
Would I be afraid of these headers? No. I would, however, have them coated. After what the welder said about the jet hot coating, I'm definitely a fan of it now. Also, there is a place in Ontario Canada that uses much the same process (If not the same). Anyone wanting coating done might want to go there as with the Canada/US dollar difference it might be quite a bit less expensive to ship them to Canada for coating.