[maxerickson]

I bet it comes down to not wanting to go through the same thing for every fork that gains a little bit of momentum.

If their accounting is competent they can anyway trivially award the correct amount of BCH at any later date (because they'd be able to determine exactly how many BTC each customer had at any given moment).

That's not nice for customers that want to trade now, but people are hardly forever screwed if BCH becomes the new thing.