What I'm wondering... I always get more semen than I can use because I see a good-looking bull and just want to try him, none of it is expensive.
But I do aim to clear the bank each year because there's a charge for storage when it goes back to the AI company and well, it seems a bit pointless keeping old bulls. I'm thinking for next year I want to put some Red Ribbon and Zeus back in the bank - they're probably both available at $8 or $10 and both have given me real nice heifers, but they'll be there for using, not for keeping for years. Hopefully in another five or ten years neither bull will have the ability to improve my herd :-)
Why would you keep a bull for years, unless it was accidental?
Tho having said that, I know some breeders are very glad they still have a few straws of Northern Exposure they can try to recreate him with.