You can't look at the TV contracts just in terms of "how much money are they paying?". TV exposure and wide availability is extremely important for tournaments, sponsors and to generate new fans.
...because it's on ARD or ZDF, on a weekend. Tons and tons of viewers who just switch their TV on and stick with it because it's the first or second channel they see, and Eurosport is Number 134.
Basic cable has 35 channels and Eurosport One is in the cable system in every state, so it is easily accessable and not 134 like you claim. My guess between 13-18 on average on German remote controls. Another exaggeration to make your case. The reach Eurosport has today far exceeds the reach of RTL/Sat 1 in the early 90s, when Becker, Stich and Graf pulled 15 times the TV ratings for Wimbledon/Masters. Don´t act like people are too dumb to find Eurosport. There is a reason tennis regularly got dumped for handball, summer ski-jumping and snooker in the German ES window, while British ES stayed on live tennis.
The Mixed Doubles olympics match for third place with Lisicki/Kas had 6.5 million viewers.
If the WTA were smart they'd offer the TV rights to ARD/ZDF for pennies. That's what the winter sports have done for years to build a fan base, and it helped them grow their sports tremendously. But that would require the WTA to look further than their next paycheck.
That was the OLYMPICS. Every sport draws during the Olympics. Eurosport drew bigger numbers during the Olympics running opposite ARD/ZDF with commercials than they do for their regular programming. Speedskating had over 10 million viewers during the Winter Olympics. The Roger Federer/Tommy Haas Halle final was live on ZDF this year and drew less than a regular wintersport event, around a million viewers.
The regular free tv station have no interest in a full two week commitment to tennis. Heck they won´t even commit to the clear structured, planable patriotic three day weekend events like Davis and Fed-Cup anymore, because it does not draw. Why does it not draw? Because the Germans don´t win. Why do they not win? Due to a lack of interest they have to play Australia on clay. That was a business decision, not a tennis decision. Otherwise Rittner should have been fired, but instead her contract was extended, because she´ll keep her mouth shut and accept her faith.
I don´t know why fans from Germany always try to deny the reality. The WTA had 10 years of exposure. How long do they need to rebuild tennis in Germany? There is no ATP here on free-tv either, because nobody cares about tennis. The only way that changes is a German Grand Slam singles champion with foreseeable longevity.
We´ll see whether the shrewd orgnaizers of Stuttgart can sell their top class field to anyone, but Eurosport. Best case the tournament and the Fed-Cup tie lands in the regional programs of ARD with options for a semifinal/final on ARD/ZDF.