At the very least, I think it's worth going to the REIAs to meet the people the frequent them. Yeah, there's a lot of people who will never do deals, and a lot of people who will maybe do a few deals, but there's also a core group of people who do a lot of business. If you can find those people, and you do some business yourself, you can build great relationships that will help your business grow even further. I always try to go to DREIA and BREIA each month, and am starting to check out some other smaller ones as well.
It's definitely possible you can get all the advice you need on this forum...I don't know though, there's something about just being able to send a text or just calling someone to get your answer immediately. Everyone gets something different out of a mentoring program though - they can't really teach you some of the core aspects of getting and doing deals. I think a lot of people will get little value out of it, but that's mostly because they were never destined to do many deals anyway. The people who have what it takes to do deals, will probably succeed, especially when they have knowledgable people in their corner, at which point they will probably also say the program was well worth it.
Another bonus of going to REIAs and meeting people who are really "doing it" - you might develop a relationship where you can call them when you need advice!