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If IBM people are in-world in order to develop new products and services, it is not fair to expect them to do it in public sandboxes. Given that simply flying over the mainland or walking through a shopping mall will bring up images that in most large US corporations will get you reprimanded and sent to sensitivity training, it is hardly surprising that IBM'ers and other corporate SL users prefer to stay in an environment under their control.
I also don't believe IBM is trying to develop applications and services for current SL residents - the market is way too small to be interesting. I think they're working on products for their current or future customers, using Second Life as a differentiator. The result will be new SL residents, using the environment as a business tool, *not* as a place to hang out with other residents.