[Stabback]

I'm also confused about why you need a valid email address for the payments. A little clarification would be good.

I would recommend against the Google account login system, I prefer to try to keep some of my life secret from Google.

Have you considered openID?

[tstegart]

Receipts, customer service contact, account summaries. There's a reason why they ask I'm sure. Its good practice to keep in touch with users when money is involved.