Hello Eido
People had different reasons for skiping the non Mandatory reserve exercise
I can speak for myself and tell you that I didn't want to get my paraglider into sea water, or my reserve or my harness , helmet, radio, shoes etc
the corrosive effects of saltwater on anything are well none and even the best fresh water wash may not complete the job
further, the need to dry all the equipment before reusing it prevents further flights in the same or next day
further, it cost a handsome amount to wash and dry the equipment by the locals, and further more you need to pay extra to some professional to repack your reserve properly
to me, the hassle of throwing the reserve did outweigh the benefits
see you in the air
Moshe Grad