Granted, it's two different genres and two different artist situations... but look at Katy Perry. She's still dropping singles and videos from Teenage Dream and that album was released over a year ago.
It's not also still a point in time where you know if they put out videos for these songs, that they're going to go up on the Strange Music Youtube channel and that be that. MTV and BET is starting to catch on (more-so MTV) to the point that they've actually played some videos. There's definitely the potential for them to do a video for Am I A Psycho or Worldwide Choppers and have it catch on for a not-so-old album.
Strange has been spoiling (or turning off, depending on how you look at it) their fans since they "got their act together" with Fontana. No longer do we have a 4 year wait for a new Tech album... instead, it's the opposite. They've already got releases scheduled for release before or shortly after the album drops... and it doesn't give the releases time to breathe. They've become complacent with their east 100,000-150,000 sales from a Tech LP and have no problem moving onto the next one to milk those some 100,000-150,000 fans (which we know is actually considerably less given the number of fans "buying multiple copies to support").
Based on the figures we know, Absolute Power remains his best selling album in terms of total sales. The new albums may be reaching landmarks (namely the 100,000) mark faster... but they don't seem to have any longevity (unless they're quietly accumulating substantial sales). I attribute this to Strange's quicker release schedule over the last several years.
I haven't paid much attention as of late, so the "norm" may have changed... but most established rappers only release one album a year, and often there's a two year gap or more between albums. I imagine if Strange would space their releases (mainly Tech's) further apart and actually took the time to promote them after their release, we would see higher per-album sales.
Though I guess with all that said, their current release strategy is working for them business wise, as it's a steady and reliable cash flow. They can release a Tech LP and regardless of when the last one came out, they can pretty much guarantee to move at least 100,000 units. That leads to overall "success" in a business sense, but less "success" in terms of the normal ways consumers perceive "success" (high album sales, awards, certifications and such.)
