My child, also 10, is top 50 in section and plays roughly 1-2 tournaments a month and has been doing this for 2 years. Total time on court for a week is 10-11 hours using a combination of clinics, a private, practice matches and tournaments.
Tournaments have been invaluable to teach mental toughness - dealing with cheaters, crazy parents, mean kids, tough playing conditions, tight rest periods, bad officials, bad scheduling etc. This is very tough to replicate in practice. Have grown tremendously by dealing with all of these situations.
Have been to most of the higher level tournaments in the section to expose my child to the environment surrounding the higher level events. Focusing on the process of developing and view playing in tournaments as part of the development process in my opinion.