I was thinking of asking Apple to combine accounts but that is likely pointless.
I sent Apple an e-mail asking that very thing and here is the response i just received:
My name is Leslie with iTunes Customer Support. I understand that you would like to merge your three accounts.
I apologize, but it is not possible to join two or more iTunes Store accounts together. However, you can play the titles you purchase with two or more accounts if you authorize each computer on which you want to play those titles for each account.
We appreciate your business here at the iTunes Store and I hope that you have a great day, Bryan.
iTunes Customer Store Support
Please note that I work Monday and Tuesday, 12:00 PM - 9:00 PM, Wednesday 9:00 Am - 6:00 PM, and Friday 4:00 PM - 1:00 AM,
Apple may also send you a survey regarding your customer service experience, not your experience with the Apple Store or iTunes. Any feedback regarding your experience; with myself as a Customer Service Agent would be greatly appreciated.