A seller should be willing to give almost unlimited access to potential purchasers if they are looking to sell. Any restrictions to showing the home will result in fewer buyers which could result in a lower price, a longer time on market or both.
Condition goes a long way in determining whether or not a house sells. Bringing in a professional stager is the ultimate answer. If that is not possible, the seller should at least be willing to remove all the clutter and 'throw on' a fresh coat of paint where necessary.
Very few owners are willing to give a first mortgage to a potential buyer. However, there are other mortgage options they perhaps should consider. Allowing FHA financing is an example. Perhaps, they would be willing to help the buyer out with a seller's concession. The easier it is for a purchaser to finance the home, the greater the chance more buyers will be interested.
Every house must be sold twice: to the buyer and to the bank if a mortgage is involved. To get a home sold the price has to be right. There are studies that have shown that listing a house at a price greater than the market warrants results in that home taking a longer time to sell and also selling for less money.
Source: KCM Blog - Steve Harney