i guess since they wanted to introduce with their music new generation of psytrancers before release of their new album its quite rational to release only one cd, since i dont think that "youngsters" would have interest in listening to 2cd's of someones "best of". imo.
sure, then there are goa fans, for whom even 4 cd's wouldnt be enough, but i dont know if that was main target of this release, as allready mentioned, i read somewhere that backfire is like an intro for those who never heard of psytrance, sort of promotional release before their upcoming album