I know there are other tribute bands out there, including tributes to Kiss, Led Zep ETC, these bands don't have the success mainly because the band members don't put anything back into the show or play the music of there chosen tribute poorly, the Aussie have ploughed so much back into the show and spent so much time in perfecting the art of playing Floyd's music, this is why they are finding great success and selling shows out, soon you are going to find it hard to get tickets for fore-coming tours just like the real Pink Floyd.
Good observation. Those other groups do not provide worthy tributes. The Aussies are a worthy tribute to the legacy of Pink Floyd.
"trib?ute (tr?b'y??t) Pronunciation Key
n.
1. A gift, payment, declaration, or other acknowledgment of gratitude, respect, or admiration.
2. Evidence attesting to some praiseworthy quality or characteristic. "