I'm guessing you live in an actual house. If you don't mind my asking, how big is your lot? My parents retired to a house on a quarter-acre and they pick up a couple neighbors' networks with good signal.
Open wireless routers were far more common 10-15 years ago, when ISPs first started pushing them. Most people hadn't warmed up to the technology yet, and security was barely on the radar; similar to what we're currently seeing with IoT.
Maybe you have no enemies and trust your neighbors, that's awesome. But, anecdotes aside, someone could cause some very ugly problems with your open wifi, without much skill or effort -maybe just for the lulz.
I feel like cheering you on for giving people free internet, but at the same time, I want to pull you aside and say "hey crazy person, please put a password on your WAP." Because, it's a bummer when bad things happen to good people.