Money doubles every 4 years with a return of 15% Then quadruples in 8 years. Multiplies 8x in 12, 16x in 16 years. So if you start out with 100k in year one, say at age 30, by the time you are 46, your 100k will grow to 1.6 million. And yes, you'll be 46 and be getting all the girls! By consistently hitting 15% singles over the years.
Then there is the matter of adjusting this return for "risk". Some strategies are riskier than others. Flipping is riskier than rentals. Rentals are riskier than holding discounted notes or making private RE loans.
So stick with the strategy that produces the lowest risk adjusted (PITA adjusted) return as close to 15% as you can.
I have discounted notes, and private loans in my IRA earning 15% or more tax deferred). If somebody I knew and really trusted came across a screaming deal once in awhile, I'd go in with him/her.
I think RE, like any other biz, is about meeting and networking with he right people. Not just about what strategy (flips, holds, paper...etc.) you use.
Uncle Phil