Why do I remember "Tanstaafl" in connection with someone riding a bicycle with huge balloon-like tires? Don't think it was Heinlein, either, although I've read both the above books.

And, Max, I agree. Congratulations for doing what you need to do, i'ts not a big thing and there is such a thing as carrying moral purity too far. Those ads are deceptive. I clicked on one once .... but not twice.