Because you want to give something to the community.
Because you are bored.
And as for Elizabeth v. Hackham?
Elizabeth has been slated for years, and visiting comedians wanting an easy laugh, or to make us feel they really know SA, will mention it. Even the creators of Bogan Hunters went to that area. So I think that sort of attention helps maintain the poor rep?
Perhaps Hackham West and its surrounding area has escaped notice, because it's a fair way out, close to other slated suburbs, Christies Downs / Beach etc and maybe even because people in the south know the rep the area has, whilst the rest of the Adelaide area don't give a stuff.
Areas change all the time. People wanting cheap properties, land etc will look beyond what they think they know about an area, and buy. Personally I wouldn't discount any area. I would look round, chat to potential neighbours / police etc, look at shops etc and make my own mind up.
I can't believe $200+ properties are now considered cheap !!