Do studios like Paramount and Sony and Warner look at the Amazon listings for the series that they release to determine whether to continue releasing them? I would have thought, for example, that with the majority of the ratings/reviews on #2 of "Hart to Hart" being of the 5-star (sterling) variety, a strong demand for more would be indicated. Unfortunately, that demand, apparently, has not translated into further releases, as it seems that favorable ratings are not enough. On the other hand, we're already halfway through "Hawaii Five-O" from CBS DVD/Paramount, and the majority of the ratings/reviews there (or a lot of them) also reflect a sterling opinion (5 stars). It is amazing that for one series, sterling reviews do not make for more releases, and for another, they do.