I don't see such a huge opportunity for income. Unless a new edition on classic VB is offered that has a large number of improvements, additions, target platforms and such it would not sell all that well. Especially considering that lots of people are moving to mobile devices that classic VB does not support. It would likely be a large investment to modify VB6 in even a few small ways and redistribute it likely larger than the demand for it.
If one was to follow the facts, one can only wonder how a company could ignore such a huge opportunity for income. At this point all those forced to .Net have gone. What are left are all the developers keeping it the 5th most popular programming language on this planet. No small number.