This is accurate.
Current costs are:
1. Hosting - $30-$60/mo depending on traffic levels. The more subscribers, the more this will cost.
2. Workstation - Its fractional, but the workstation I use to build this isn't free.
3. Dev time - This is the big one. If this is to become sustainable, I'd need to build up subscription fees to pay for a team. $200k/engineer, administrative staff, and whatever an editorial staff costs if I go down that route.
Saying "it costs nothing" would be a recipe for eventually shutting down this website since I'd be working towards none of the infrastructure above that's needed for this thing to continue on without me.
I also want to build out a mobile application, which also costs money in the form of App Store fees and dev time.
Keep in mind: I'm not targeting the HN crowd with this, who know how to find CurrentEvents, throw it in their RSS feed, find the optimized mobile version, etc. This was built for people who don't have the time or knowledge to do the digging needed to find and format this content.
What HN found interesting was the relative rankings of news website speed, which I hope brings awareness and results in faster websites for us all.