They're gathering a heck of a lot more than that, but even so, I consider them harmless in my sim as I imagine the worst they can do with the data is compiling market statistics on things like how many people are using which meshbody, or perhaps more accurate / interesting traffic statistics for virtual real estate purposes. Or maybe something much more nefarious! I have no idea.
That said, on the topic of this thread, funnily enough I came across these products just this morning - I don't think it's against TOS to sell them, but to any that would use them, i'd say good luck defending it. LL seems to be pretty cut and dry about chat logging.