Why, if Namibia is so inhospitable, did the Germans try to colonize it?

Probably for fancy rocks n shit, or just because they can. Wouldn't be the first time Europeans rocked up and settled in a place that the natives knew better than to bother with. Also, did the Germans really try to colonize all the parts that nobody lives in, or did they do the things Europeans usually do and actually go to where people are already living (in other words, the places that are good to live in) and kill the people who were there so they could live there instead?