Some we do, some we don't. It has to be the right home. We have to weigh up the pros and the cons. Pros - he is taking our name out there. Always wherever he goes, in shows, they will say Thordale Borealis or Arcturus..... so that is the best advert for our stud and breedlines.
We also have Daddy so what use is another colt to us that can't breed with any future mares we keep (same Daddy)?
Also we don't fall in love with those we know we want to sell. We love certain ones and they are for keeps, like Fivla (I was offered a blank cheque for her last year) and some of our riding horses but we breed to sell. We knew that when we started so we try very hard just to give them the best upbringing and start before we send them on their way to the nicest homes we can find.
It is not an exact science and we have been let down before. There is little you can do to safe-guard their future.
(and there is always a tiny voice that makes us want to keep them all)