Brown's Net Price Calculator

I’m currently a senior thinking about applying ED to Brown, but when I ran their net price calculator, the number I got back was quite horrifying. It estimates that I’ll have to pay 30k when my parents earn barely 25k in a year. We do own a house though so when I ran it without that number, the expected price was significantly lower.

So I guess my question is how accurate is Brown’s NPC? Will it be too risky to ED to Brown?