Who needs a 5,000 sq-ft house?
Answer: People who want one and can afford it.
A buddy is building a 14,000 square foot house. Moving in this coming spring. Pretty big for just him and the wife, but they will be entertaining grandkids there in a few years.
If that sounds big, the largest home in his neighborhood is over 50,000 square feet, but then again, that guy has 50+ grandkids over for Christmas every year. I guess it's all relative.