Four things:
1) before everyone else jumps on you - do a search. There's a lot of stuff on here, particularly in the FAQs.
2) totally possible. depends on the location. If you are willing to live somewhere awful, you can def make over $200/h. There's a reason that post is in the middle of nowhere Nebraska. If you want to live somewhere with a tight market (NYC, Boston, SF, Denver, etc), expect to make substantially less.
3) common advice is that advertised jobs aren't the best ones. places that have good jobs (read: happy EPs, low turnover rate, low BS, not seeing a ton of pts/hr) don't have openings often and don't have to advertise their jobs in the throw-aways/online or use recruiters.
4) 15 12 hours shifts ain't nothing.