It's not a huge expense because the numbers are so few. Because the numbers are so few, then making special arrangements a requirement for business and public spaces is foolish and costs too much. There are far more people who are physically handicapped so it makes sense to make bathroom accommodations.  

I'm not putting and restrictions on people who think they are transgendered. I also don't want to pay for sex reassignment surgeries any more than I want to pay for viagra or boob jobs. Do I have the right not to pay for your cosmetic surgery?