One of the agents from TTS will explain this better, I'm sure, but the requirements for a title search, etc may come from Florida real estate laws/regulations.
Disney may be able to confirm that the contract is paid up, but they have no legal standing in determining that your seller, for instance, isn't in the middle of a nasty divorce proceeding and might not own clear title to the deed. Some of the contracts on the market have been owned by companies/corporations rather than individuals and the niceties of those sales are different. Say a company bought
DVC to use to reward employees, but the company is entering Chapter 11 and DVC is an asset being sold to meet credit obligations... Lots of scenarios out there. The title insurance protects you from situations like this that are in all likelihood rare, but possible.