Shame to hear your coming back home, but I actually think your doing the right thing. Hanging around there indefinatly for a job that could well never come is bound to be soul destroying, and you can at least say you've given it your best shot.
No doubt you'll go back to Maun at some point, and when you do it won't be such a leap into the dark and you'll be a face that all the operators will remember. Good luck, respect for what you've done!