I had that happen too. Just remember that, because you're only in electronic contact, they won't know what advice you do (or don't) follow. A lot of it is good advice, some of it bad, and some you can't use at all (e.g., sometimes it's not feasible to visit a school on the other side of the country).
Also, try getting in touch with some of the graduate students in your field at the schools as well! They tend to be more open to giving advice, if a bit more harsh, depending on who you talk to.