Why is it that many rappers cannot duplicate the success of their debut albums?

I think its hard to duplicate a clic first effort...Most of the times it seems like when Hollywood level type success comes into play...the artist kinda lose the hunger or may try to go another route that my not appeal to the core that made that first album successful...For instance Redman's Whut the Album? was a clic...but the second album he seem to had gotten rapped up in the Meth/Red fiasco...He changed his style up...Ppl wasn't feeling that...Same as Snoop and Nas...Their successor albums didn't have the same feel as the first...It nothing wrong with change but there are consequences with it...you can lose you core audience...Look at what happened to Common...He did Electric Circus and nobody was really feeling...I didn't at first it took awhile to grow on me...Same with Mos Def's last effort...It was different in some aspects but the style still would have to grow on ppl. I think Queen Latifah had to be one of the only rap artist to transition into another style successfully that I can think of...and do alright...I would say IceT also with Body Count but I'm not to sure. But this is a good question...because a lot of artist careers are almost ended or they are pushed into the underground from lack of being able to keep the success of their first efforts.