In my experience, the indoor invites are more of a showcase and they do not hold a lot of weight with coaches and athletes. Outstanding athletes from the previous year are the ones invited to the indoors. Coaches are not allowed to be involved in the indoor track meets because the season has not officially started. There are very few indoors because it is difficult to find sponsors. If there are any, they are just another stepping stone to the runner's progress against competition.
Coach Payan
www.CoachesEducation.com