some check them periodicly and have others checking it for them on the daily....others check theirs all the time...but the answer to the post is that a large amount do....from what i seen and heard....
you can def contact people thru myspace... message an artist a bunch of times, and most of the time eventually they will reply or atleast read it....it wont bother them, they get sooo many messages that when you send them a bunch it just makes you stand out....
tryyy it....