Answer:
What get wet while drying
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
In many years, not much has happened. In many minutes, a lot has happened. In one second, everything has happened.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.