Thanks for the feedback guys...
Matt... I'm DEFINITELY not blaming the Chotas in anyway... I would highly recommend them to anyone looking for a high quality wading boot. I've had mine for six years and have worn them a ton... in many different wading environments. I'm almost ready to get a new pair of wading boots and they will be Chotas.
My waders came with skirts, but I haven't used them... maybe that's the issue. The wear starts primarily in the heel area, but by the end of the season the whole area of the foot is pretty ragged. The rest of the waders are in decent shape.
It's my second pair of waders in three seasons. Luckily, they are not that expensive, but I hate just tossing the waders simply because of the foot wear.
Didn't think you were blaming the Chotas
Like Nik said, the skirts might help keep debris (sand, stones etc...) out of the boots. Otherwise, I would consider switching brands of waders. Even though mine have held up (with numerous patches), I don't think I would buy Cabelas again.