It's okay if you're not using NameTerrific today. I'm sure you wouldn't trust your important domains with any random startups that you've never heard of before (and you shouldn't). But let me answer your questions:
- Security. I've invested a lot of time in security. Basically the whole system is running in a private network and the only public-facing node is the load balancer. The DNS servers are running in a separate network and connect with TerrificDNS controller with a secure connection. eNom API requires IP address verification. Credit cards are stored completely outside the web service. I've paid attention to common attacks (injection, CSRF, XSS and mass assignment).
- Points of failure. DNS is a difficult thing to handle because the uptime is critical. That's why TerrificDNS Anycast uses Amazon Route 53. If you're uncomfortable with NameTerrific's DNS servers, you can choose this outsourced solution. 100% SLA.
- My background: It seems true that my age is more of a perceived-technical disadvantage rather than a marketing advantage, especially when considering the seriousness of my project(s). However, I've been coding for 6 years (with 4 years web) so I think it shouldn't be a serious limiting factor.
Thank you for your compliments! I'll prove myself with time and results.