Ditto!  Before  reading fisher's response I went to you site.  As soon I was asked to go through a registration process I was gone.  Very few gals do this and I just don't see the point.  You want traffic on your site, don't you?

You're well within your rights to stay within your comfort zone.  The issue is that what you've done greatly limits the market size for your product.  I agree with others in that if I don't know you, I'm not giving you my email address in the hopes that I'll like what I see.  Sounds like you'd be better of telling the ex sister-in-law to eff off, but that's got to be your call.