Yes, but there are plenty of dealers who do think speaker cables do make a difference, and they're being honest too
As much as I don't think there's much if any differences in these things, I wouldn't use interconnects that are too basic. I've had some shoddy ones in my time. Yes, a wire is a wire and all that, but it needs to be put together properly.
I've never had a dealer 'push' expensive cables on me, quite the opposite, but I'm sure they'd let me buy some if I wanted them. I'm not sure if Rick does the same? He lists a couple of cable companies on his site, and it would be daft not to have something that someone is prepared to buy.