Um, this doesn't collect all the B5 scripts. It collects all the JMS written B5 scripts. Which, admittedly, covers around 70% of all the scripts, and all but one of the last few seasons' scripts, but, for example, you won't find the Neil Gaiman or Peter David written scripts in these.

Also, it's still possible to order the whole batch of 15 volumes (which'll set you back around $600 with postage); if I'm recalling correctly, final date for ordering and getting v15 is around the 20th of this month. Doesn't seem to be on the webpage though; http://www.babylon5scripts.com/