The $475 is the charge by the company that Disney referred you to.
DVC itself doesn't charge anything to change the names/ownership on a membership. You could use a different company that might not be as expensive. My family used
LT Transfers to change the ownership on several timeshares my dad owned, and they were a lot less expensive than $475 for each one. Or, as someone mentioned above, you can do it yourself for even less - review the first page or so and then the last few pages of the
Gratuitous Transfer thread here.