Estibot is a few thousand lines of code that live in a server.
It doesn't know anything about the real world.
Your domain could be worth high $xx to mid $x,xxx.
It depends on:
1. How much exposure the name gets,
2. How long you're wiling to keep in on the market,
3. How the name fits with buyers business uses / purposes,
4. What the budgets are for the buyer(s) and their use(s).