Of all the reviews (good and bad) on Amazon, Best Buy,...

Of all the reviews (good and bad) on Amazon, Best Buy, Brookstone and the like, yours is the first to experience corroded rubber and/or the glue failing - and it has happened to you with two pairs. So, all I'm doing is trying to look at possible causes.

Of course your ears sweat - there are sweat glands in the outer ear canal ... http://hearinghealthmatters.org/waynesworld/2016/earwax-and-sweat-glands/

If you don't believe me that some people's skin/sweat is more acidic than others - read about it, it is a fact (related to your body's pH levels) -

http://www.sciforums.com/threads/what-causes-my-corrosive-sweat-and-how-can-i-counteract-it.113487/

http://forum.slowtwitch.com/forum/S...lon_Forum_F1/HIghly_Corrosive_Sweat_P5300223/

http://www.tdpri.com/threads/corrosive-sweat.285838/

http://www.drummerworld.com/forums/showthread.php?p=1388678

http://forum.gibson.com/index.php?/topic/93514-corrosive-sweat/