No, we sureley did not plan to have so many

. I got my first couple from someone who kept them in a small cage for 2 years without letting them fly. I never intended to have birds, but I felt so sorry for them so I talked the owner into giving them to us.
We did not have a clue about how to keep budiges, the only thing we felt was that they needed to fly and to get a bigger cage. So we built a large aviary and then it looked so empty with only 2 birds in it

. And also they looked bored from time to time. So we got some more. It was funny to see how the budgies changed their behaviour when more and more birds came to their flock, I think the most important change was when we had 6 birds, with that number they hardly ever looked like they were bored, there is always some other budgie who also feels like playing. Now with 10 birds (our maximum was 11) they are very active and fly around and play quite a lot.
No, we never really had lots of difficulties when we got a new bird. Only one time we got a budgie that was kept on his own for 2 years after his partner died and he was totally shocked to see so many other budgies. He just sat on his branch and did not move (he did not even eat or drink I believe) for about 2 days. And then he suddenly became the most active bird of our flock, he got a female partner and became friends with all the others

.
But once I got a very overweighted female budgie which was kept in a tiny cage for all of her life (6 years) and she also did not have a partner. When she came to my flock she was so happy and she fell in love with a male budgie. And then she wanted to lay eggs even though we don't have any sort of breeding box. Because of her bad health she had problems with the egg and she needed to have an operation and unfortunately she did not survive it.
So I am careful now not to take lonely females which are too overweight to avoid things like that.
But normally the birds that come here see the flock and the aviary and they want to move instantly into their new home. The 'old' budgies are interested but careful and look at the new bird a bit sceptical for the first day or two and after that they are part of the flock.