I agree.
For satellite stuff, good RG-6 is sufficient.
I do some ham repeater work, and using big diameter hardline is almost a necessity to get the thing to hear mobiles and handhelds from any decent distance away from the repeater.
Using the same theory, I bought some RG-11 to use on my UHF antenna for
HD OTA signals. I was using RG-6 and some of the canada UHF stations are just on the edge of not being received (they blink the lock light on my OTA receiver).
So I put the RG-11 on it to see if it would pull in the Canada stations. Nope, pretty much the same reception as before. RF is RF, I surely would have thought it would have made a big difference, but it didn't.
RG-11 is thicker, heavier, harder to manipulate thru the walls, and uses special connectors (different from RG-6) so your crimp tool is probably no good on it.
For digital satellite, having a digital lock at 70% with RG-6, then 75% with RG-11 will make absolutely NO increase in picture resolution or quality. It will be the same. Analog TV is different, but from my experience RG-6 is just fine.