Re-Releases of Albums That Are Still Produced

[Emu]

Okay, so, today, I bought The Beatles' "Let it Be...Naked" which is basically just a re-release of Let it Be with a new cover and another CD that talks about life in the recording studio during recording of the album. Aside from that, it's exactly like any other copy of Let it Be that's been under production for the past 30 years.

Now, this is all well and good if you're like me and didn't own Let it Be to begin with, but why bother re-releasing it at all if Let it Be is still being produced normally? Why couldn't they just stick the extra CD in with new copies of Let it Be without going to the trouble of making an entirely new album?

Same thing goes for Pink Floyd's recent 30th anniversary edition of Dark Side of the Moon. My point is that this seems kind of stupid to me. Is it just companies bastardizing great classics for a bigger profit or is there actually some kind of point to it I'm not picking up?