I think that's generally the accepted thought, but it is more about economy and not quality (in my opinion). Operators are generally not going to spend the extra money for the extras in prem/LE, as it would take longer to recoup and in many cases, make no difference in earnings. Plenty of commercial establishments do buy Prem/LEs.

I think if Prem/LEs did break more, it's simply because they have more things that can break. Not to discount your observations, but it's anecdotal and without hard numbers, impossible to really know.