Fellas the WNBA is the most unwatchable Womens sport on planet earth. I watched it rarely its inaugural season, then forgot it even existed. But don't worry fellas we don't have to watch a game this season, b/c not even the sportbooks spend time doing that..... Luckily.
The Reason the forum has been calling the WNBA an ATM is, b/c this sport is the least bet of all the sports. So the Sportsbooks set soft(inviting) lines to encourage the public(square) bettors. Also the Sportsbooks don't research the WNBA at the level they do NFL or NBA. So this gives anyone who is willing to spend the adequate amount of time researching, a huge advantage over the books.
In other words it's like trying to buy something on EBay. It is impossible to get a deal on EBay, b/c the whole world is bidding on the same items. Therefore it's impossible to get a deal, leading to all items being at fair market price due to EBay being widely used. Now that's NFL, and NBA.
The WNBA is the Garage Sell of all betting forums. There is not a huge amount of interested bettors comparatively, so those who get their first can get deals before line movement. And the sellers at the garage sells, b/c they have limited customers, have to offer low prices in order to attract customers. Or in other words, "Soft" lines by the bookies.