I really think it's just luck. =/ Some seeds are good and some are not. I've tried several times before, but this time instead of doing the four tooth pick thing I used aluminum foil to suspend it over the water. But, I started two doing the same things and only one grew so... -shrugs- My advice: keep trying and eventually you'll get a seed to sprout.
When it get a little bigger I'll plant it in a big pot. I live in Northeast Texas, and it gets too cold in the winter. While it's smaller I'll bring it inside during the winter. When it gets about six feet I'll plant it in my yard, and cover it up with some kind of tarp to keep in warm during the night and cold days. It three to seven years I can expect fruit!