"There is sticker shock due to a combination of higher rates and house prices," as well as "underlying reticence to purchase a home, given the housing bust," Zandi said, as evidenced by single-family rental being "real competition to buyers."
Mark Vinter, managing director and senior economist for Wells Fargo Securities in Charlotte, N.C., is, however, expecting to see conditions improve in the second quarter, with more traditional buyers coming back to the market and the percentage of home purchases financed with mortgages increasing.
Data from at least two sources, and some anecdotal evidence, show an increase in the number of all-cash, non-investor buyers in the first quarter of 2014.
There have always been cash purchases in the higher-end housing market.
Toll Bros. CEO Douglas V. Yearley Jr. said just that in a meeting last week in New York when asked about the effects tighter lending was having on the luxury-home builder.
Yearley said 20 percent of the Horsham-based company's buyers are all cash, while those who take out mortgages put down 30 percent.
Guy A. Matteo, an agent with Re/Max Preferred in Newtown Square, agreed, saying that all-cash buyers comprise "a small percentage of my overall business - mostly higher end."
Jeff Block, of Berkshire Hathaway Home Services Fox & Roach Realtors in Center City, said he had just sold a lot for cash "in the seven figures," adding that there are always some of these sales in this market, but never a lot."
"The rise in cash purchases appears to have been driven by a surge in overseas buyers and an increase in the proportion of retiree and second-home buyers purchasing homes with cash," Vinter said.
Realtors chief economist Lawrence Yun said the findings "beg the question as to why we're seeing higher shares of cash purchases."
"Restrictive mortgage-lending standards are a factor, Yun said, "but the higher levels of cash sales may also come from the aging of the baby-boom generation, with more trade-down and retirement buyers paying cash with decades of equity accumulation."
Yet, BHHS Fox & Roach agent Kit Anstey, in West Chester, sees a different scenario. He said that buyers seem to have less cash because equity dropped substantially when the housing bubble burst.
Echoing what Zandi said, Anstey pointed out that some of these equity-poorer owners "are renting their home, not selling."
Tighter credit requirements haven't helped, said Jerome Scarpello, of Leo Mortgage in Ambler.
"Lenders have been told that if a borrower's debt-to-income is over 43 percent, they lend at their own risk and do not have the safe-harbor protections of the agencies," Scarpello said.
There is a misconception among many first-time home buyers that they will not qualify for financing under the new credit guidelines, which is not the case, said Malcolm Hollensteiner, director of retail lending sales and production at TD Bank.
Mortgages today "are not one-size-fits-all," he said. "Lenders must look at each buyer's unique financial situation on an individual basis before allowing or denying financing."
One reason for the sluggish real estate market most often mention by Philadelphia-area agents and brokers is the shortage of inventory, which Zandi attributes to "a disconnect between potential buyers and sellers and the appropriate price."
All-cash, then, might be a negotiating tool in some cases.
Martin Millner, of Coldwell Banker Hearthside in Yardley, said a listing in Lower Makefield, priced around $470,000, "generated multiple offers, and the buyer we contracted with is paying cash."
RealtyTrac reported that, nationally, 42.7 percent of first-quarter sales were all-cash, compared with 19.1 percent in the same period a year ago, with Pennsylvania at 42.1 percent versus 21.8 percent in 2013, and New Jersey 40.6 percent versus 19.1 percent.
While agents here have had more than usual, it hasn't been overwhelming.
Millner has another all-cash deal - $335,000 - in which parents are buying a place for their daughter that will be an investment, "If and when she moves out," he said.