Why does it take porn developers months to role out an update that might only have 10 minutes worth of extra play time?
Updates seem to average about 1700-2000 renders each, not counting animations. If an update takes six months, assume that means the artist created 10-15 unique new images every single day, including weekends and holidays.
While I don't work in DAZ software, I imagine sequential images in an already-composed scene don't take terribly long to pose. Any new location has increased setup time, lighting, scene composition, and asset compilation. After that's done, the images still have to be rendered.
These guys both have full time jobs, so they're doing content creation in their spare time.
Don't take my word for it, though...DAZ is free to download. Teach yourself how to use it and see how long 2000 renders with quality lighting, clothing changes, location variation, and posing takes you. Maybe you'll make a workflow breakthrough that can benefit the whole development community.
