Usually this issue is addressed as one where the owner got the CYA too high inadvertently. Aylad (Jan) insists she has far few problems keeping her CYA at 80 and running higher FC levels. I have no reason to doubt her since Jan knows her stuff really well, but it's still anecdotal info, not a controlled test testing a mechanism.

There are two drawbacks to running a high CYA (like 100ppm).
First, you MUST have an FAS-DPD chlorine test kit--Leslie's sells them online for about $20 (that's just one test, not the whole kit with pH, T/A, CYA and CH).
Second, you'll need to run higher chlorine levels a la Best Guess Table. Ben suggested that the only thing you should be concerned with (assuming a healthy pool) is fading bathing suits--he suggests "Last Year's suit", not you expensive, fancy new one.