In Internets time he had a buzz like 5 yrs ago and was new on the scene. He hasn't gotten any radio rotation or a single that has stuck and the 1 that did, he never capitalized on. The thing is labels don't know how to translate the internet/youtube rapper buzz into something tangible yet.
These radio-friendly artists ain't selling like that so why invest all this money into a kid who has youtube fame?
Granted, they put him on 106 and Park and the BET awards but even after that he really never gained ground or real interest.
FUCCK Mixtapes. Get you someone who has sense and when your song is hot put your album out by yourself.