Yes, this is true even in the case of traditional publishers. Authors will usually make around $1 per copy in these situations, if they're lucky. Writing books, sadly, is more of a hobby than a money maker for most authors unless you're really exceptional at marketing.
My phone number changed, my physical address changed, and they made no effort to find me. I just recently contacted them via email and they told me they reset their password log-in credentials with my current email address but it's still not working. They've now stopped responding to emails. I'll try calling them this week. I'm nothing if not persistent. : )