Re: Setting a real point limit, instead of AP limit
Personally, I often allow players to breach AP limits, as long as the limitations are, as has been said, real and actually limiting. A once a day power taht you only NEED to use once a day (and costs so much END you'd be unlikely to use it more than once a day) doesn't really count. I'm talking more about powers that have feedback, or might go wrong, or something like that. I like the idea of having an energy-blaster who has his regular array of powers, but has a partially-limited blast that just goes up and up in power with ever greater END costs and Side Effects (damage to user). Sure, it could be used to take out the big bad... but if the big bad has a one-shot ubershield, then you've wasted your blast, and possibly knocked yourself out... best to wait until the bad guy's in a bad way anyway.
Hero's strength is team vs team, anyway, not team vs one big bad. You take out one enemy, you take yourself out... no net gain.
So yeah, I'm with Shrike. It's something you can do, with heavy GM scrutiny. Hero already requires a certain maturity among its players, due to the potential to abuse the system. This is why stop sign powers can exist -- the GM is advised to say no unless it's a good build. Same thing applies here.