Probably because CRT-based RPTVs are prone to burn-in. See the following FAQ on that topic: If you're only going to use the TV as a "static image computer monitor" part time (say 20%), then this should be OK, as discussed in the FAQ. The TV has a DVI/HDCP connection according to the specs I read - what are you planning to do for audio?
Thanks for the reply!
Now that you mention it, I do believe that burn-in is the reason for this warning.
I looked up the user's manuals for some random toshiba plasma HDTV's (which i believe is also prone to burn-in) and they also had the same warning, and this warning is absent from the user's manuals for toshiba's LCD HDTV's.
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