With the improvements we are at 24K and what about the roof, siding and windows which take you up to 35K easily Thats far from 125% gain over 30 years. What about 30 years of miscellaneous maintenance too?
Taxes are high, maintenance costs are much higher and there are vacancies with hooker/druggie squatters to deal with. Sometimes neighborhood kids think it would be fun to burn down the immigrant owners house. Those are a few reasons that come to mind.