It's a rare man who can say he loves his job and wouldn't change anything. I know I'm not alone when I say that an aviation career is not what I expected it to be. I still enjoy it, but for reasons that are vastly different than the reasons I
thought I would enjoy it.
Personally, I'd say getting paid $70k to do something that you love is better than $150k to do something you don't... ok, maybe 100.

Being home every night is envyable as well, but then again, financial rewards and a measure of security is its own worth as well (but the older I get, the more I'm convinced that financial security comes from good management of money rather than shear income... but I digress.)
Remember, EMS
tops out at $70k. Last I checked, it starts around $50k and takes about 15 years to move up into the $70k bracket. But if you want to do that, then do it. There's more to life than making money, and if you wait to be happy until you make the big bucks, it won't ever happen (because there will always be someone making bigger bucks than you!)
Is it worth it? Only if you say it is. I don't know too many EMS helicopter guys (or EMS fixed wing guys, for that matter), but I imagine they'd say pretty much what my airline compadres would say; some hate it and say its just a job, some guys love it and can't believe that they get paid to do what they do. Most of us have days of both.
-Goose