There are far more MtF cross-dressers because wearing men's clothes usually does nothing for women. Wearing women's clothes is exciting or relaxing for (some) men for a whole variety of reasons that have been endlessly hashed on this forum.
I don't agree about the TS ratio, though. I believe there are about as many FtM as MtF transsexuals. It's just that FtMs usually have a pretty easy time to go stealth, so they tend to be less visible as trans people than MtFs.
DeeAnn's comment is interesting. I joined a local support/social group in 1993, and it was about 90% crossdressers / 10% transsexuals. For a variety of reasons, I dropped out of the trans community around 1995 and only rejoined in late 2013. That same local support/social group now consists of about 65% transsexuals / 35% crossdressers, a huge shift from before. (And I've shifted from believing I was a CD in the 1990s to knowing I'm TS in 2014.)
