Reality TV Stars- X2

Although I am an avid TV watcher, my favorite ones are reality TV shows. In particular Bravo shows, especially Top Chef. I find it to be a little bit more educational than the Kardashians. This new season of Top Chef is an "all star season", letting those who have already competed in a Top Chef season compete in another season of cooking to try and win the Top Chef title once and for all. This has made me come to realize though, that reality TV shows are using cast members that have already previously been on a show or on that same show. 

This trend started years ago when networks like MTV aired Real World/Road Rules Challenge shows using cast members from previously aired Real World and Road Rules seasons. Then networks like VH1 caught on and had shows like Charm School who used girls from other dating shows on VH1. Finally network TV has kind of put a spin on this idea by creating shows like Dancing with the Stars and Skating with the Stars using B or C list Hollywood stars, athletes, etc. to compete on the show. Furthermore, many people who start off in a reality show with many people seem to be getting their own spin off shows like Kendra and Holly who were on Girls Next Door. They both got their own TV shows on E! after their time with Hef ended. It seems like reality stars and already known famous people are being reused on shows. How can anyone new in the world get their 15 minutes of fame from a new reality show?