Yeah, you won't likely work through ten points of moxie in a session... but then, not many players are likely to have ten points of moxie. That'd cost 135 CP or RP - a hefty sum, given you only get 1000 for each PC (EDIT: At character creation). Most players are likely to fall into the low-to-middle range of three-to-six points, a much easier quantity to exhaust. A seond thing I'd point out is that Moxie isn't a 'Luck' stat - it's a 'doing it well' stat. The two things I see it being used for are, yes, making failures into less bad failures, but also for those situations where an 80-skill character fails a task they were really unlikely to fail. Yes, it can be a luck stat - but it can also be a 'plausibility' stat in the right circumstances. Oh, and a note on Moxie that I fear some people may miss: You can't use it to turn a sucess into a failure unless flip-flopping the numbers would work. You can flip the digits of a roll around. You can turn a sucess into a critical sucess or a critical failure into an ordinary one - but you can't make a failure a sucess unless the digit-flipping thing works. Of course, the higher your skill, the more likely it is that flip-flopping a failed roll will result in a sucess - meaning that you can't get by on luck alone. That said, I'm a more cinematic kind of GM, and if a player wants their character to be awesome within the machanics, I say let them.

From experience, I find Moxie to be quite a broken mechanic. For instance, a friend of mine in our current session is playing as a Jovian Flat, which means very little of his CP has been spent on purchases for technology. The GM allowed him to have a powerful exoskeleton/heavy armor for free, as part of the characters backstory as a military leader in the Jovian Republic. So, he maxed out his moxie and then spent the rest of his CP on combat skills. This essentially means that (in a heavily roleplayed, less combat oriented session), he can succeed or critically succeed every roll he makes, regardless of his skill, and survive intense amounts of combat, while being relatively immune to hacking. As a harcore infomorph player, I do not approve of this Flats antics.

But I can vouch that it was rare when any character ended the mission with more than one or two moxie remaining. The Max-Mox players spent their Mox (slightly) more freely while the Low Mox players rationed it. In the end, sometimes they ended up in a bad situation (usually of their own making) and needed to throw everything, scrape the bottom of the barrel, rack all their collective brains for ideals to survive- or at least complete the mission.

Just had my first EP play session, and in a simple set-up session where players averaged 2 rolls each for the entire night, 3 of us needed to spend Moxie just to keep from falling off the damn hull of the ship and floating into space, and 1 of us needed to spend it to avoid crit-failing his only hacking roll of the night.