Maybe it's a decent gamble - if you lose, you bite the bullet on the 2 months lost rent, get the rehab done and get someone in at 3900.

Has anyone here paid for the Mastery course with Fortune Builders and had any success that they feel they wouldnt have gotten without the massive gamble?

They gamble on appreciation. 

The only thing that matters is how much you're willing to gamble.

There's no "best way" to accomplish this and it's a gamble every time.

You shouldn't be spending it, gambling it, or investing it.

If you can't buy the property right it's a gamble, not an investment. 

does not mean this will also happen to you.So this is what you do.YOU need to do a cost/deal calculation for every method for lead generation you are considering for your market.Now you know how much money you need IF you were to do DMM, or IF you were to do bandit signs.Now this is DATA, so you are not gambling much here.Then factor in the effort it takes and the time it takes for a deal.Bandit signs may be almost free but it is illegal and a LOT of effort and work, and again risk for hefty fines.DMM simply is a bad idea... so figure out what is feasible and then you go for that!

You are taking a gamble because a bad tenant could cost you way more than appreciation, once you subtract out the transaction costs.  

An investment of anything is a gamble.