1,500 to 2,000 seeds per plant isn't uncommon when full pollinated. Seed viability start to drop after about 3 years so unless you're planning on growing hundreds of plants at a time I doubt you would ever use them all. A controlled pollination of a few lower branches would provide you with plenty. I normally do this and get between 60 - 100 seeds per branch. Separate your males and pick the best one. Trash the rest. Capture the pollen from it and use a small brush or a Q-tip to dab the pollen on the female flowers, then mist it good with some plain water to remove the excess pollen.