Hi,
I had to discontinue the same for two reasons:
I did not want a probable registrant to think of alternative email address when I am offering one, more so why should I force them to have one?. ( a marketing point of not dishing out an alternative )
Many registrants did not have an alternative email address.
However, I would want to make the email address (demographics) as optional instead of required field. I tired and goofed up so put up an alternative. I am just thinking of putting it as a hidden field with some xxx.yyy2324567.com).
Anup