You need to remind yourself that the overwhelming majority of populace are not HN users. Most just want a cheap "internet box" that gives them WiFi. If any had interest in going deeper into networking, they would build a router themselves. But if you had some extra unique features on top of DD-WRT, that might turn a few heads. I do recall Tomaz Zaman on Youtube building their own router completely from scratch - not saying it's 100% what you plan on doing, just a reference point for you to look at.