Different areas, different situations. Very simplified example, but consider the following...
In my area, there are lots of very similar 3 bed houses in terms of age/size/layout between £117k-£130k, £13k difference. Elsewhere, very similar 3 bed houses might instead be between £315k-£350k, £35k difference.
In each area you find two houses with identical land and layout. The first house is top of the price range but is decorated perfectly, brand new high quality kitchen and bathroom. The second house is bottom of the price range, with tired decor, kitchen and bathroom.
Despite the differences in housing costs, salaries are similar as are goods and labour costs of redecorating/refurbishing in both areas.
£13k is barely going to cover redecorating and replacing the kitchen and bathroom to a high standard in the cheaper housing area, and there'd be the added inconvenience of living on a building site. And, at the end of the day, £13k isn't going to add a huge amount to the mortgage. So you may as well buy the perfect house for a bit more.
Meanwhile in the more expensive area, £35k should easily cover redecorating and refurbishing to make the house perfect and leave you better off than buying the expensive house in the first place, so you're more likely to live it with it not being perfect immediately. Also, £35k is a fair bit extra to try and get a mortgage for. So in that area, you may as well buy the cheap house.
The difference in prices is 10% in both cases!
We're not worried if the house prices continue to drop after we (hopefully) sell and buy. The next house we're looking at getting will be our forever home, so we're expecting to be there for the next 30 years and will just stay until we expire if necessary!
But anyway, all our possessions are already in the loft or garage.
We haven't had access to our books or DVDs for months, all our photos and ornaments are gone, and poor DD has no toys left in the house - she plays with the feather duster and hand hoover!
Our prep for viewers is cleaning up after the rampaging toddler and moving/hiding the day-to-day stuff like the nappy bin/toilet training seat, laundry baskets/drying racks, the rice cooker/food processor, the coffee table/rug, etc. Either for squick reasons or mostly to make the house seem as big as possible.
We don't set the table or scatter flower petals or anything. 
To be honest, I'd like to think I'd tell appointment breaking viewers to work to my schedule instead of theirs... But I'm so meek yet eager to sell that I'll just keep agreeing, running round like a loony then being let down. 