Maybe I'm the kind of customer dealers like. The way I figure it, I could maybe save a little by "rollin' my own", but I don't even own a breaker and rivet spinner, so that would be another $100 or so. My usage isn't all that high anymore...I've purchased exactly 7 loops in the last 12 months. At that rate I couldn't make it pay for a long time.
On the other hand, at $13 a loop, the dealer is probably making only a couple of bucks, if you count labor...barely enough to account for overhead, let alone profit. I get to B.S., get the industry news and looks at new equipment and tools free. And when I phone there at 5 minutes after closing to order a part, I don't get any guff.
That's worth something to me. Just my $0.02.