Well, we do that around here when it's congested or busy in/out of local Class D's with training traffic. The idea is that it takes time to get Class D clearance before entering the airspace. Switching over to Class D from 122.75 while inbound and not hearing a call from an outbound plane or someone else in the area could lead to bad stuff.
I've heard others covering for an inbound plane....
123: "Northwest Practice Area, Cessna 123, inbound to Deer Valley, 10 north along I-17 at 3,500, last call, Northwest"
123 goes off air
456: "Northwest Practice Area, Cessna 456, 7 north of Deer Valley climbing to 4,000 and heading to the outlet mall, Northwest" (outlet mall is right on I-17)
unknown: "Cessna 456, watch for another Cessna inbound along your route and altitude, last call was 10 miles a minute ago"
I guess I'd rather hear it than not...