a quick google will tell you that kids under 5 and people over 65 are killed at a much higher rate in single family homes and that there are way too many of them. i'm not a contractor, but a sprinkler system for a three bedroom, new house, is less than $2000 in materials, if connected to  the board of water supply. add $500 if you use a pump and tank. $68,000 for labor?? sweet.