That is a really good question! Trulia really needs to be the one to answer this, but if I had to venture guess it might be to increase the traffic to their site.
There has been an increase in those looking to purchase a foreclosure and by having homes showing up in the Trulia site it would increase the amount of traffic being sent to their site. Other than that it really does not make a whole lot of sense to show a home that is not necessarily available to purchase.
Hope this helps!
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C. Lee Miller
Keller Williams Realty LA Harbor
DRE Lic #01882648
877-645-4110 Direct any time