There is more options available to you then to exploit or not to exploit. Obviously you should always start by reporting the thing you came across. Afterwards if you hear nothing and get no reply, then consider bringing it up with your friends. See what they think. Players should come to a consensus whether or not the exact thing you found is a exploit or something more likely a "cool feature". If it a /bad/ exploit (definition by other posters), just stay on the high ground.
But if things like... Windowing, as others have said, never came to the light then it would never have been labeled WAI so we can use it in LFM and as we please. And without people knowing it and using windowing, the devs wouldn't have labeled it such a way. The debate needs to be important to receive important feedback, IMHO.
If epic questing really does work at heroic levels, I would not be suprised if it was standard LFM in a few months. Would be nice if it was either labeled WAI or fixed... It really sounds like a fun challenge to try EE GH Madstone at level 17. What a blast that would be. "Guys I'm low enervation scrolls, only got 300 left!"
EN Jungle, LoD etc. might speed up leveling 17-20. But idk. They added tomes to speed up our leveling... Doesn't seem like a huge issue
Anyways my point is ... Exploits like shears are removed when they get known. Exploits like windowing become a standard when it's known. If you get no feedback from bug/exploit report then bring it up local before going global.
If we go by the others definition on "bad" and "good" exploits. Then I encourage you to figure out which kind they are, and then share the good ones while burying the bad ones in a pile of exploit reports.
Through it does become fun after a while, when you join a Maze oM group and someone says "one of these days I have to learn how to run this quest normally"