In fact, we rather not take Nxt as purchase price, but we don't know where else Nxt holders can spend their coins.
Well, you could always open up your NEX/NIX IPO to other currencies (such as BTC), and let people pay using that instead of NXT? If NXT holders really want to get rid of their coins, they can do so at bter, dgex, etc. These exchanges work for me (although I do understand that your NXT deposit might not have cleared yet, due to it being just 1 NXT).
We can open up this option to the investors when payment is tendered.