Okay, if you were to find already cooked BBQ that you thought was awesome, would you sell your smokers and stop cooking?
Making rubs is part of the cooking process, IMO. Sure, I like trying commercial rubs, but I cannot see myself ever giving up on spending that 20 minutes tops to mix up a rub.
That's like buying a chili mix, or a jar of sauce, and saying, "that's good enough for me."
Again, I have nothing against commercial rubs, but there is something intrinsically fun about making something yourself. If not, we would all just eat out.
It is not an either-or thing, IMO. If you only make your own rubs, you are probably missing some good flavors. If you only use commercial rubs, you ain't a cook. That may piss some people off, but IMO, good cooking is a journey -- no, it's an adventure -- it's certainly not a destination.
CD