"Startup vs Startup" allows startups to practice their pitches, get feedbacks from mentors and other startups, and increase user/customer base with the help of other startups. In each meeting, all members and attendants are encouraged to help the pitching startups in one way or another by downloading their (free) apps, tell friends and colleagues about the new products/services, or refer potential leads, etc.
Startups need to unite and help each other. Each startup will get an opportunity to pitch, and we all can learn from each other.
If you light a lamp for someone else, it will also brighten your path.