Why are buyers waiting ?

I have 3 or 4 qualified buyers who won't get off the fence despite low prices and lower mortgage rates. No matter how good the deal I bring them they still shy away and say they're going to wait. This seems to be the sentiment nationwide as confirmed by a survey by Realtor.com, read below:

According to a survey conducted by Realtor.com, home buyers in the U.S. are hesitant to jump into the housing market, given the current economic downturn. Nearly 53% of the survey participants said they have postponed their home plan on account of their negative outlook. Uncertainty on the job front was the main factor for not buying a house for nearly a third of the survey participants. Nearly 16% said they worry about selling their current home, while 8% said they fear home prices will keep falling. Home buyers recognize that the housing market currently offers great deals; however, financial worries far outweigh attractiveness of the deals available. Nearly 20% said they were interested in foreclosed homes with an attractive price, while nearly 15% said they want to receive incentives such as the $8,000 tax credit for first-time buyers. Errol Samuelson, president of Realtor.com, said buyers feel that purchasing a foreclosed home is more "complex" than other transactions. Among the survey participants, only 28% said President Barack Obama's plan to tackle the foreclosure crisis is working, compared with 41% who said it isn't and 27% who didn't know.