I'm no God botherer but... there's something obscene about people pi$$ing $125000 away on a fairground ride, when kids are drawing there last starving breath in East Africa.
Famine is the result of insane population growth rate in a region that is essentially a desert. The land cannot support this many people, hence the famine. So, if space tourists decided not to spend $125.000 on the tour and instead fight famine in east africa, - I seriously doubt they would be able to do anything productive and leading to a long-term solution, simply because nothing can be done.