no kidding... having exactly the same problem.

I rubbed a little silicone grease on them to hopefully moisturize the rubber a little (is that stupid?).

Would smearing some RTV on them help seal up the holes and make 'em last longer?

The good news is that they aren't THAT expensive... $153 each HERE
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Warning! Do not sear the top of your neck hole in the molten lactate extract of hoofed mammals.