I too like experimenting with citrus grown from seeds, but I come into it with the realization that I will not get any fruit from these seedlings for 5-7 years. I just have to be patient and wait see if any new, worthwhile fruits are produced.
That being said, even just a couple of years into my citrus growing, I am starting to see some variations in foliage that lead me to believe that, in a few more years, I will have new varieties of fruit to try.