I dont think people realize the process needed when experimenting with seeds. Its not just plant a seed, let it fruit in a few years and away we go. The plant will need to be monitored for many years for the following: fruit quality, tree characteristics such as cold tolerance, disease resistance, growth habit, etc. These are all things that can, and usually do, change from year to year while the tree is in a juvenile/devellopment stage. You will then need to see how it reacts when grafted, and even grown in different locations. This process can easily take upwards of ten or more years. This is not usually accomplished by planting one seed either.
Those who are planting seeds especially of mono varieties (for example the Indian varieties), keep in mind you may invest years, space, cost to find out you have a fibrous piece of crap that will need to be cut down. This experimenting is usually done by people who invest their life into it and have plenty of space.
Look, I am all for people who have the time and space to take this on but most have no idea what they are getting into. Gary Zill did not just throw out some seeds like Jack and the Beanstalk and get these top varieties in a few years. He invested many many years and lots of time, space and money to get to where things are. There is a reason he is not doing it again.
Just my 2 pennies on the subject...