I agree, people should be able to buy a name change in ascension especially since there is and always will be people that buy and sell the accounts for both main and ascension.
I look at it like this, you get a name change in main by using all of your Market Trades then why not set it to a Life Force amount required so that you do have to sacrifice something to get it.
I also think that it would be nice to get an extra one with each ascension kinda like we get a race change in main, after all, you can't change race in ascension so a name change should be worth it.