Now.....for those that actually want to know why I do what I do, here is some information.
I use breeders from one yard (or cluster setting) and move a queen from another apiary (or cluster of yards) due to the impossible lack of controlling every aspect of genetics as some may so easily suggest is possible as seen in some bee books, and advice from those that write books, but yet do not practice half of what they try to teach to others.
It's easy to understand.
My mating yards are set up in "clusters".
All the genetics from a particular line of bees in any yard are not confined to just the bees in the managed hives. Last years swarms, located in the surrounding area, as well as the genetic material spread by the drones of those yards, and all in the immediate area make up the genetic matter in any given area. I am not just trying to keep bees from the same hive from mating, but I am also trying to keep bees from the same lines from mating.
In doing this the best I know how, it makes sense if a breeder is brought in from another cluster of line of bees, so not only are the daughters being raised not breeding from drones from the same hive, but more importantly, they are not mating with the same genetic line as sometimes sits in the same yard (or in the area via swarms, etc.)
So whether a queen can sense a drone from her own colony or not, it makes not one difference. I don't want the new queens being mated with genetics of the same line, whether from the same queen, sister hives, or from the same genetic line.
Sure, drone saturation with a different line, helps. But that just means your playing the best odds. To be assured of the highest genetic diversity and to guarantee your queens will not mate with drone from the same line, (Other like genetic hives in the same apiary), then bringing in a breeder queen from another cluster of hives is the BEST management task you can do.
And THAT...is doing what produces the BEST queens.
To be clear...
If you have a breeding yard with one genetic line, surrounded by drone support yards with another line, (And this is what is suggested in books and not much more) you might get good queens. But swarms and the blending of these lines will lessen your quality over the years. And certainly it's not always as clear cut as some books suggest when your keeping more than one hive and mating more than one queen.
If you have a mating yard with one line of bees, and they are surrounded by drone support yards, then the best possible scenario is to bring in a queen from another yard in your operation, thus leaving nothing to chance, and you control or eliminate inbreeding and other issues more effectively.
It's not that hard to understand why I do what I do if some actual thought goes into it.
You can do what some suggest and get good queens. But I'm sure some writing books, perhaps would do things differently from what they write, if their livelyhood was dependant on queens, and not selling books. :-D