Isn't the female supposed to visit the male for stud service? That will help prevent the male from roaming, but of course he is a Malamute. The red flag( to me) is that she wants to use him 1 or 2 times a year. That is quite a lot for a male that has not proven himself. Personally I would go ahead and stick to your own plans or keep him intact and show him first. If he wins, X ray hips and elbows. Then you can ask way more for a stud fee. Otherwise you'll be just adding to the pet over population. Just visit CL and a few shelters. There are way too many dogs whose owners thought they were worth breeding for.
To know if you are doing things right, you should be willing to trade places with your dog.