I have not been living in Ghana but visiting.
Was living in Kenya and Uganda for 12 years, and went to Ghana some times for holidays, thats all.
Comming from a very violent part of Africa (Nairobi called in local; Nairobbery), I really like to spend holidays in Ghana.
I don't belive that a western can make it for 8 thousand USD a year, that is not much, taken in to consideration, that you are used to an other way of life. Of couese if you live like an Ghanian with a resonable income then you can do it. But for a western I don't believe it.
The remarks of others about beeing am ATM I do agree, most africans take newcommers for that. You know, they can almost smell that you are new! Even I can feel when a person is new in Africa, so take care!!!
One advice in your new life, learn to bargain hard, if you don't you pay prices that are extreme. Learn it, learn what the local people pay for food on the market. Always ask for more when you make a deal, if the vendor says no, then leave, they will call you back to negotiate.
This goes for all aspects of life for a white in Africa.
But also try to find a few on the market that you deal with when it comes to dayly shopping, it will help you.
Soon I will go on retirement, and I can tell you it will not be in the violent east africa, I also plan to settle in Ghana with my pension. Mine is after tax in Denmark (there is no doubble taxation agreement between Ghana and Denmark) little over 2000 USD months, in my oppinion that wil juat make it for a nice life.
Also don't forget medical insurance and please don't try to save money on this. It can ruin you.