I'm interested at least

does he still do it for the drugs?

hell yes

Why the band name at all? This is basically a solo act now.

Because he wrote all the songs himself alone, why would he release the Smile Empty Soul songs under a different name?

They're still working as a band. While Sean Danielsen front the project as the main songwriter, their albums are still collective efforts. Even in their last album, on which he remains as the only original member, the bass and drums were composes by Mark Young and Victor Ribas respectively, who were part of the line-up at the moment (in fact, Victor Ribas is still part of the band).