I have a question/comment.
If you are selling to a friend (and assuming you completely trust your friend), does one even need to use a closing company to transfer the timeshare. In other words, can't the seller simply fill out the paperwork and submit the transfer request to the timeshare company to complete the transfer? Of course, the timeshare company may impose a transfer fee, but this would have to be paid regardless if a closing company is used or not. If so and a closing company is not required, then you may be able to save a few dollars here.
On the other, when it comes to money issues (even if the transaction involves a good and trusted friend), it might be worth the extra dollars in having a closing company handle the transaction.