There was never any real reason. Except they were NEW.
OK, I never got chalk dust out from the seams of my black jacket, but so what? A sacrifice I was more than aware of when I started.
So whiteboards - well, first of all train your cleaner not to touch it. The damned things need glass cleaner and kitchen towel or you're buggered. Anything that leaves a residue is anathema.
If you are unfortunate to inherit an almost-black whiteboard, clean it with all the alcohol based products you like, but wash it down with water, apply a glass cleaner and buff with kitchen towel. Brand new (and if you followed the glass cleaner/kitchen towel advice will also stay that way).
OK, we have a whiteboard (no real reason, but, hey we've just spent thousands getting them).
What can you do with a WB that you can't do with a chalkboard?
Except project the OHP.
Which brings us to what can you do with an IWB that you cannot do with a projector and a few fridge magnets?
Moving stuff on the board we had sorted; the board is steel, we have magnets. So IWB what DO you DO?
Ahhh that would be the expensive software and aftercare.
Take away the saleman and we are left with an elephant in the room. But who is the elephant? The management who buys it or the teacher who unquestioningly thinks it's the best thing thing since sliced bread?