So what do you think oh reader?

I see this and come up with two questions: why and what's it worth to you?

When someone wants to excuse themselves from a fixture in the game, the first thing I want to know is "why?"  Why do you need this and what do you hope to get from it?  How and when do you plan to use your special ability?  If it's just a cosmetic thing, then I'll be correspondingly lenient on the consequences.  If it's a powergaming thing, then I'm far less likely to approve it.  If I do approve it, then it'll cost, likely more than the potential gains.  If you want to deviate from the expressed use of the powers in a meaningful way, then the cost may go up and unplanned costs are always higher...

The next bit asks what it's worth.  Accidental hexes occur as a result of compels, right?  Normally, it would cost a Fate point to prevent the compel, so you're looking for something that can substitute for that expenditure.  Assuming we're looking for balance, that "something" has to cost you.  The hex effect comes as part of the character's high concept, which makes it a bit more difficult to explain away, too.  You don't just get whatever it is for free or by throwing a few words down on paper.  What's it worth to make your character an exception to the rule?

Maybe he's so attuned to and used to the lightning rod system in his home that he's more hex-prone outside of it (e.g. can't spend a Fate point to avoid, occurs more frequently).  Maybe he takes stress or cannot recover from stress if he is inside the lightning rod system.  Maybe he has to sit with his feet in one of those hydrotherapy foot spa devices so the running water grounds out his magic.  Maybe all of that, maybe even more.