Signing up for a backcountry skiing group tour gives you an opportunity to meet new people who have the same interests as you. If you already have skiing friends, there’s nothing wrong with expanding your circle.
The great thing about group tours is that you can learn from each other, along with learning from your guide. Someone may show you a technique you aren’t familiar with that can improve your skiing. On the other hand, you could teach someone the proper form for a particular feature.