Thats what we thought at first too, (as a b2b startup) - except that if they as a company haven't moved on past IE6 they are not very likely to adopt new technology in general - including the startups products.

I wouldn't push for banning IE6 if you are selling a non-tech product, but if you are a tech company and have a feature IE6 holds you back from implementing or are losing time to supporting it, dump it.