I love w.c animals as long as they are something special worth taking from the wild, not just a normal.
We have bought and sold a LOT of cool w.c balls, everything from new morphs, existing morphs, specials, to just odd ball gravids, and have had great luck with them.
It really depends on how you approach acclimating them.
20 gallon tank with a heat light, aspen bedding, and handling = a animal that I can almost guarantee will not thrive.
A w.c animal set up in a rack system with appropriate size box ( 6 quart for 400 grams or less, 16 quart for 400-1000 grams, 28 quart 11-1800 grams, etc) and keep them dark and on cypress mulch with no handling they can do very well.
I have a group of about 20 w.c specials and morphs that I have had for 4-6 months and all but 1 eat live domestic rats every week just like a c.b animal does. It is all about how you keep them. When they come in worm them, and black knight the cage to kill the ticks (mites are not native to Africa) and leave them alone for 3 weeks and they should thrive!
If you get a w.c talk to someone who has experience with a good number of them, and has gotten them fresh, as pet store animals have been threw hell and back so are different than most reg. w.c. Don't handle them and set them up right, and you will have a great snake that is worth the xtra work!