The author of Rich Dad/Poor Dad says your gun is a "Doodad".
Option A) If you have a 100k home (fully paid off) and its value doubles in 10 years, $200k, 100% profit.
Option B) If you take out 50K from your home, buy a 2nd 100k home and rent it out (rent covers mortgage). Value of homes doubles in 10 years, from 200K to 400k. Your original 100K has now made a 300% profit. Leverage is a powerful tool when used properly.