Well Rober, a lot of reasons. I'm in the process, season by season, of trying maintain just 2 hives, and maybe a couple nucs for insurance.
When my hives swarm and I catch the swarm, I've increased my apiary. If I split I've increased my apiary.
I have a guy that comes and gets my swarms, for free. He's trying to increase his apiary. But every winter he looses all his bees because he refuses to treat in the fall, and I'm pretty sure he doesn't feed either. So I feel like I'm sending all my nice healthy bees to the gallows with him.
So, the last two seasons I've been learning how to maintain and sell nucs. So far, I've sold 3 this year. But I now have 8, and all are queened now and still waiting for buyers I run all mediums tho. So our seasoned beeks are teaching the new beeks to start their hives with deeps, so it's harder to sell medium nucs. Trying to get it across to our bee club that 2 meds equals 1 deep. It's slow going.