I think it has been mentioned before that SAA is a taxpayer funded operation, therefore its not a rush by managment to get things done. (Based on a prior post of the SAA Baas up in Kruger etc)
On another note the taxpayer pool in SA is not that big. At least with the money that counts, once it goes away theres no further necessity for border guards at Zim, you wont be able to tell the difference.