They are not. I went ahead and made a new account with the same e-mail used to originally purchase. Nothing. Hmmm. 75 dollars down the drain? I hope not! I made a support ticket and attached my original purchase invoice.
My guess is that significant changes happened with their account structure since Beta. I never even played Live. Only beta.
Which beta? I started in the post-kickstarter beta with the Mercenary Edition pre-order. My account credentials have never changed and I even the layout of my order history page is the same and fully intact.
Anyway, support is usually pretty solid, so I suspect they'll have you up and running soon.