that's just not true... the cheaper stuff really is cheap, just like any other maker.
shimano 2200 and sora are really junk, just like campagnolo mirage and xenon.
you have gatorskins and you're still getting flats? If they're not pinch flats, then the only tire that's better would be schwalbe marathon plus, but they run a bit wide, even in 25mm width and have a terrible ride quality for widths under 35mm.
I've never had a pinch flat. But I used to commute to work and I would get flats all the f'n time. It was really frustrating. I would find little pieces of jagged rock or glass or something that would cause it. A staple happened a few times.
The only thing I can possibly think of why it wouldn't be the tires fault is this:
I have a Road Morph frame pump. It has a little pressure Gauge. So When I pumped up my tires I would pump it up the the 120 psi the tires were rated for. My pump at home didn't seem to like presta valves (though it said it would work), so I used this a lot at home too.
If the Pressure guage was inaccurate at higher pressures (which seems very plausible, given how roughly it moves as you approach high pressure), than I could have been over inflating the tires.
That would increase flat vulnerability if I understand it correctly.
I run the 25mm Gatorskins on both my road bike and fixed gear. I have a new shop pump that works well for Presta's so I suppose I'll see.
I just know I've had days where I've gotten flats, repaired the flat on the road, only to get another flat later on in the ride (different location on the tire so it wasn't just me missing the object that punctured.