The OP in this thread is doing it after trying to keep unaltered males together to repair an injury that ultimately could be life threatening.
There was already a great description to reasons why, but I wish to add some...
Keeping them as pets, which I am.. it's my understanding (according to my vet and other animal advocate type folks they will live longer with less complications and be overall happier and healthier with less behavioral issues. Seeing how many reproductive issues (tumors, cancer, etc) arise with folks chickens... makes it seem more like a truth.
Plus, I am keeping both genders and I don't want to have the responsibility of packing them for Camp Kenmore (good one). That takes away the pet aspect for me and makes it work. I don't wan't to deal with protective moms that are unfriendly and unpet like. And I don't want a ton of kits to find new homes for just to see the proliferation of them being given away on CL or abandoned at shelters.
Potty training is said to be easier with alteration as it decreases the need to spray.
Both of my mini pigs are also spayed/neutered. Both my male cats are neutered. All 3 dogs as well.
If you aren't eating them or the offspring, it's just contributing to overpopulation and that isn't MY cup of tea.