It's the principle (although I see where my post made it seem like it was about the money). How many forms of voluntary mail correspondence do you know of that don't provide you a postage pre-paid envelope? I'm sure there are others, but I can only name one....

If a bulk postage rate (cheaper) is too much for them to shoulder (which I seriously doubt), just charge me an extra quarter on my license fees to make up the difference.

I VERY seldom buy stamps, because I VERY seldom need them. Having to go somewhere to buy a stamp makes sending it in harder than it should be, especially in a day when we should be able to submit our data, real time, electronically. We'd get more, better data, in a more timely fashion, and I would shut up about needing to buy a stamp.