No, that's not entirely true. A lot of people are under the mistaken impression that their fiat balances (at least the 55%+ portion) will be converted to BTC/LTC/ETH when the new site launches. And I can see why people think this; refunding fiat users with this formula was the only solution they provided on the forums and the only thing that we are seeing in practice.

The fact that we can see the USD/USDET market on the tokens page, though, tells me otherwise. That tells me that fiat holders are getting fiat money credited to their accounts when the new site launches. How valuable is that fiat money going to be? How reliably can they get it to customers? If it gets frozen during transfer due to association with BTC-e, can you reliably get the money back in your account? When these types of issues have happened in the past, that is not always the case. Dealing with their support can be......challenging.

This is one of the reasons why the refund might be optimal for some users. Another reason is that users can immediately take advantage (or at least hedge against) the current volatility.