"Most windows replaced in the last 5 years. Detached single garage. 24 hours required for showings. Showings only from 3 to 5 daily. NO SUNDAY SHOWINGS. Offers being accepted Wednesday, April 29th at 5pm."
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What the Re agents are doing is creating a silent auction. People see the place then put in their secret offers at the same time on the same day. Typically the seller wants over asking and without conditions and with a nice fat deposit cheque along with it. 
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If they don't get the offer they want so what? Wait another 2-3 weeks and have another auction!