Any big issue with redirecting members url to a different website?

[freakin]

I'm curious if people notice any huge issue with having basically websites set up just as tours for your main website where when people sign up they get sent to a different website url than the one they signed up on. I figure if people see good content they won't care, but sometimes it's hard for me to look at things from a member's perspective. I can "spoof" the members section of my main website, but there's a couple issues with that.