I'm sorry, but, I'm having a really difficult time understanding why total sales would matter. Particularly if it's simply a binary Y/N. Did you make over 50K Y/N. Did you make less than 700k Y/N. As far as we know, that's the only thing they are asking. Anything else is just speculation.
To be honest, I have no idea why they are asking this really. I can't see how the information would be useful. About the only way I could think of it being used is they would make that line sort of the trigger line where they might take a second look at the OGL material to make sure that it's kosher. Anyone with sales of less than 50k wouldn't be big enough to bother checking, but, if you have sales over 50k, they might want to give it a second pass.
Other than that, I don't see the point of it to be honest. And, fair enough, I can see that it's ruffling feathers. I do actually rather hope that they drop this line, or, at least, explain why they are doing it. And, frankly, it had better be a pretty good explanation or the midden is going to hit the windmill.