Well, Bonzaii, all depends on how you budget. I got away with spending a tad shy of 1000usd per month. And I was there together with my wife. And we went Nam - Bots and back again. And Vic Falls inbetween, and some sightseeing on top of that.
But then again we stayed at campsites while some had private rooms in hostels, travelled from Windhuk to Swakop with a combi while some rented cars, and hitchhiked form Maun to Kasane and back while some took flights.