On buying DVDs

So today at Costco I picked up The Bourne Identity: Explosive Extended Edition, Widescreen, of course.
I am seeing a trend in DVD releases lately. Release the movie as soon as feasible on to DVD after its theater tenure. Get the rental money back, then flood the retail market with copies. Nine months to a year later, release another version of the same DVD, only include myriad extras. This was done with the X-Men 1.5 edition, Black Hawk Down, and more recently with Saving Private Ryan.
I had been keeping my eye on The Bourne Identity at Target, waiting for it to drop from $19.99 in to their $14.99 or even $9.99 line-ups. The new DVD version was $18.88 at Costco.
So the lesson is becoming clear: if you really liked a movie enough to buy it on DVD, wait until the extras-filled DVD is released. Rent it from Netflix in the mean time.