Is dyndns still relevant?

So we made 5dollardns.com while waiting for other idea for S12(got rejected). The original idea was to be simple, straight forward and as cheap as possible dynamic DNS. So we used GAE and AWS route 53 - done in a day. Decided on name/price - $5/year for 3 A Records and off we went. While got some traffic we didn't get any logins/payments/users. Then we switch to freemium - first A Record free, any extra - $5/year. Got few logins/users but still nothing worth mentioning. Now the question is : in this cloudy world of ours, is the dyndns still useful?