No question, they are scrambling to get at the stars any way they can. And while there might be a little value in this, it's not like having them on the court competing in matches.
Ironically, Martina, Anna, Venus and Serena were all stars before they actually joined the WTA tour. They brought star power with them when they arrived.
You can, over a long period of time, acquire a degree of star power purely through your tennis skills, but usually, only within your sport.
Pete Sampras is the ironic proof of that. While Pete is arguably the second best tennis player on the men's side who ever lived (second only to Laver), he has never become an American sports icon. He remains less well known to the public than McEnroe, Connors, Agassi, perhaps even Borg and he isn't an American. There will be an aweful lot written about Pete now that he is stepping down and so he will become better known, but I don't think you are going to see replays of his great matches, as you did all the great Borg/McEnroe match ups at Wimbledon.
Off the court, Pete is not as dull as he has been painted, but his brand of big serving tennis was never very exciting on the court.
They are already replaying the great Martina/Venus match ups as classics and they will continue to do so over the years. That's because both played with not just skill, but flare. They were great matches to watch.
And then there's their off court personality and star power which pretty much drawfs anything Pete ever had.
Unfortunately, I see no one right now who can match that on the women's side, so if Venus and Serena continue to take extended breaks for tennis or even chose to follow Martina into early retirement because of injuries, this sport will sink into the dolldrums until someone comes along again with star power.