vordmeister - 8:41 pm on Mar 15, 2011 (gmt 0)
Back in 2003 the reason was I felt the section deserved to be expanded but couldn't see how it could be done on the existing site. It maintained it's traffic after the move and increased in traffic over the years with the new sections far beyond the traffic of the original site. Will keep you posted on this one.
This one is a bit different - I can see more things the shop needs, but mainly the expansion will be more products. Main reasons for this move are credibility and branding.
It's encouraging that you've recently split a site Tedster - suggests it's not a completely crazy idea. How long did you keep links to the split sections in the original site's navigation (if at all)?