I have had a zwallet account for nearly one year, and so far I have a total of $5US (approx) in my account, and this is with 38 people in my downline. The site looked promising, free email, and even better, they pay you to use it and pay for a ten generation downline. However, you must use your email a lot and generate a downline that also uses it a lot. Another problem is that the email service is very unreliable, so much so that many sites will not allow you to open an account using a zWallet address.
Bottom line: if you have friends who will use their accounts a lot and you also use a lot of email, then you might be able to make some money, but don’t use the account for important email business, you might not get your mail!