Sometimes I'm on top of emails, pm's , and voicemails...and then on occasion I will 'drop the ball'. Usually it's because I'm too busy and trying to coordinate schedules before I can commit.
Also, please be specific in Emails..." hey girl are you around?" will go unanswered. That just turns into a time wasting back and forth that usually doesn't lead anywhere. If you have P411, then please email a request via the site. It's easier, faster and I'm going to ask you to do it anyway.
I have a bad habit of putting the fun friendly, "just want to say hi" emails in a special folder. I like to reply to those when I can compose a thoughtful and personal message. I like when people email just to shoot the breeze or tell me something funny...but I might not respond in a timely manner.
I'm sure I'm not the only one who feels this way. Hope it helps the new guys.