Caitlin is going pro as she wants to stay in the Midwest where her fan base is. Yes, she has fans nationally but Indiana, who has the #1 pick, is much closer to her IOWA home and is in B10 Country.
Her endorsements will outweigh any possible salary she would get from a WNBA team. She alone will raise interest in the WNBA games. Every personality you hear on the radio or TV has said pretty much the same thing, she is single handedly caused TV viewership to go up and arena's wherever she plays to sellout.
I saw the interview Holly Rowe (ESPN) did. She was in Minneapolis the other nite for her game against Minnesota and the crowd was majority IOWA. She talked to people who made the trip from other parts of the country to see Caitlin play. She will go down as the BIGGEST influencer of Women's Basketball in America at any level for generations to come.