Multiple Web 2.0 properties on the same account.

I have scraped a few High PR Tumblrs and Weeblys to link to my money site.
Weebly allows 10 properties under 1 account while Tumblr allows unlimited.

Is it okay to have them all under 1 email account or should I put them all on seperate email accounts.
Will Big G find out if I have them all under 1 account?

You sort of answered your own question. Obviously having them all on separate accounts is safer than having them all under 1 account.

You don't necessarily have to create separate email accounts for all properties; all you need is patterns. It's totally natural to have 2-3 Web 2.0s under 1 account with different themes. Just keep yourself easy and be natural, no need to be paranoid. G won't find out unless you want it to find out.