This response from Cindy Miller, Director of MLS and MetroTex Associatin of Realtors:
Most MLS’s do require reporting of the sales price. We only have the provision because of legal counsel’s opinion is that we need to provide buyer’s that option as long as Texas remains a non-disclosure state – but it is a matter for each MLS to address, so we could change that at anytime – though it is doubtful. And there is no disclosure in the Texas deeds.
As far as the fines, that is not unusual either – in fact NAR just amended the MLS Policies to allow a max fine of $15,000!