JRV is bang on the money...the reason RLD/PXP were able to secure so many big name gonzo directors at their inception (including pretty much everyone at Anabolic at the time) was because they were offering sweetheart deals which included ownership.

When the management changeover took place (David replacing/usurping Dion), then that approach changed, and talent became disgruntled and left, taking their rights/titles with them. Vince Vouyer has his own company now. Lexington Steele has his own company now. Erik Everhard and Mike John both jumped ship to Jules' company and so on and so forth. This explains part of the reason for the gaps in the back catalogue.

The second part of the reason is RLD's early marketing strategy which allowed them to grab such a big market share...they punted out both DVD and web content for absolute peanuts just to get it out there. Oversaturation might be therefore be the problem...retail stores aren't going to order 'new' catalogue titles when there are a shitload of said titles out there to be had for cheap secondhand, or the scenes contained therein are plastered all over the internet.