Depends what you're comparing them to? I owned a 1,250 square foot house in Cook County, my property taxes were $7,300. Moved to Bourbonnais, have a 2,100 square foot house and pay $4,500 a year in taxes.
I had been looking at Manteno, but their property taxes seemed considerably higher. I think it has to do with how much revenue from businesses come into the area. Bourbonnais has some big stores like Target, for example. Manteno doesn't.
I'm unaware of people leaving this area. I love it here. Bourbonnais has good village services, our snow gets plowed in a timely manner, iif I call about a street light being out, it's fixed in a couple weeks. Very nice village.