I was thinking about attending ATP's regional jet certification class, and I was wondering if it is worth the $6,000 for the week
Speaking from experience, No. I went through a similar program and am still paying for it. Luckily, the loan was nearly interest free. Blee256 said it; you are paying for the reduced minimums and the guaranteed interview.
Let's break it down. You could argue that if you have a decent amount of total time and multiengine time, this class would help you get an airline interview.
But, remember that you are guaranteed an interview, not a job. Provided the airline is hiring pilots, you still have to be liked and perform well during the interview.
If this is the case, and you do have a respectable amount of multiengine time, there are much better ways to spend your $6000.
If you are short on flying time and you do this class, what happens after the class? You'll have "graduated" from a CRJ course, but nobody wants to look at your resume until you have more flight time.
If you really have $6000 burning a hole in your pocket, consider this.
-Find an airline pilot that is a current CFI or an AGI (I'll bet there's a few on these forums). Pay them $50 / hour to help you learn 121 regulations, basic RJ (or turboprop) systems, the concepts of crew coordination, and checklist flows/callouts/profiles etc. After 10 hours of that, you're down $500.
-Study on your own, for free, the things you learned from above.
-Put the other $5500 in the bank. If you want an interview, find an airline pilot and buy them a cup of coffee for $5 (or 5 cups for $25), and convince them you are not an idiot. I'll bet most would be willing to help you out.
-If you are short on flight time, take the remaining $5475 and find a seminole or duchess to rent. Take a friend with you and go fly off the $5475 under the hood, getting cross country time and practicing instrument approaches. This will help your performance during the job interview.
How much multiengine time could you buy with $5475?
How much multiengine time would you get for $6000 at the RJ class?