I wondered the same thing.
Except for two Red Star roosters which were slaughtered at 9 weeks and not aged at all (they were tough and tasteless), all of the consumed home-grown chickens (many different breeds--no cornishX) have had a much more intense chicken flavor than any store-bought chicken I have ever eaten. They really tasted like rich, rich chicken.
But we have not eaten any frozen ones yet. We slaughtered four at a time, ate one fresh and froze three. I am hoping that they will taste like the fresh ones.
I think it has been worth it, because I enjoyed the whole process--watching them grow up and trying to figure out which breeds we had.
However, if I hadn't gotten so many laughs out of their antics, I might be looking to buy someone else's free rangers already processed and frozen. It was a lot of time and work and expense. But the flavor has been so good that eating chicken is now a pleasure, instead of a ho hum.
Carol in Minnesota