Reaper had steady ratings that actually went up a little from the first weeks, it was also against AI.
90210 had worst ratings than Reaper the last 2 months, it's ratings are falling.
Yes and more importantly no.
Yes it the last two months (the last 8 episodes) Reaper averaged 2.003 million viewers versus 1.965 million for 90210.
But total viewers are not the primary data source that networks use.
The focus for all networks is how a shows performs in various Demo groups. That is what is the primary factor in setting ad rates (followed by income level of audience, then total viewers),
Now each network can market to different demos. For example CBS focuses more heavily on the 25-54 age group (and why it needs more viewers), while others seek out the 18-49. And the netlets have focused on the 18-34.
Now compare those two shows in those Demo groups. Starting with what is most important with the CW.
18-34
Reaper .85
90210 1.31
90210 is going to generate a ton more income off of ad rates.
Then the standard 18-49
Reaper .85
90210 1.07
So even with most networks 90210 would generate more revenue.
Then how about the anti CW demo the 25-54
Reaper .8
90210 .89
So in even that demo, 90210 is going to generate more revenue for the CW.
And thats just this year, even last year with Smallville has a lead in it didn't do well in the demos. With a below 1.0 average in the adult 18-34.
We have to understand that if you are under the age of 13 you really don't count much in primetime, and if you are over 55 you really don't count much in primetime.
I am not saying any of these things because I like 90210 (or One Tree Hill, Gossip Girls, ect) or that I hate Reaper. Because I hate the teen soaps and I have enjoyed at least some of Reaper.
But it is a business, and Reaper has shown in two years and 3 different time slots that it doesn't fit with the CW and doesn't generate enough revenue to continue. Hell it might do far, far better in syndication (where it will get more coverage and often better time slots). And yeah against Idol is tough but many shows have tough time slots. Hell I hate that most of Supernaturals life has been in historically the toughest time slot all year round.
And unlike all the shows that did get renewed, Reaper has no outside revenue that goes to the CW. If it was broadcast overseas that doesn't go to the Warners or Viacom. DVD sales don't go to either parent company, internet sales don't go to either parent company.
Thats why Privilege a show with significantly fewer viewers and a slightly worse adult demo (though a significantly higher 18-34 demo) would have been saved over Reaper, because the CW's parent companies to get outside revenue from a show like Privileged.