I learned this last year. Ran across an insane deal at Jegs on some Doug Thorley Tri-Ys plus a $100-off coupon. I couldn't submit the order fast enough and was on cloud 9 that day and the next. Woke up on the second day to an email saying the headers "were discontinued and Doug Thorley has not offered any replacement item", as if to point the blame to DT. I called DT directly and the rep gave me the lowdown between them and Jegs and said the headers were certainly NOT discontinued and they had multiple sets in stock. I only bought the headers in the first place because of the (presumed) low price, but Jegs left me with blue balls and I was already determined to get some, so I accepted the mildly discounted deal from DT.
Anyway, this opened my eyes up to a few things about Jegs that now all made sense. Summit FTW.