ORIGINAL: BGfisher
What it boils down to is economics. Nobody needs a 32" draw until they reach a wingspan of about 70-80". This may or may not correlate to a person's height but is often close. This means that to justify a 32" draw a person would have to be in excess of 6'6" tall. In reality there just aren't that many people that big, so without the demand it doesn't make sense to cater to a very small amount of people. It costs a lot of money to make cams and modules and then not be able to sell very many.
There are a few companies that make longer draw bows. Martin has a couple up to 36".
How right you are...