They might, if the rent per the EA is very much above the comparables. They could argue the agent is benefited by a higher rent (managing the property and the fee is a percentage of the rent) or mistaken. Also I think it would depend on who the agent is - much harder to argue against Sherry Fitzgerald than some one man band.If an EA rent valuation was attached to the Notice of Exemption, would they really start a dispute to question a licensed professional?
You're obviously much safer with an EAs valuation, but rents are increasing and if they continue to do so, the government and so the RTB will have to take action. They'll have to be seen to be doing something to prevent 'gouging'.