Budgies are all different just like people, the main thing with having a super tame Budgie is repetition, love, patience and trust.
I have a Super Tame Budgie, he was a hand raised baby that was thrown out of the nest. Getting your budgie from a reputable breeder helps also. The more you put in the more you will get back.
However in saying this some budgies simply prefer to be a lone, happy and content bird being appreciated for his qualities.
Just like some budgies will talk and others won't.