Remeber that you have to do a "aptitude update" or click on Reload in Synaptic after adding keys. If you add the key and then immediately do "aptitude install latestcoolappforaurora" you still get a GPG key error.
In your example wget saved the key as a file to the hard drive and apt-key then read the file off the drive rather than any information being passed through the pipe (|)
The " - " in about commands indicate stdout and stdin and the pipe takes the stdout from wget and passes it along to stdin of apt-key which is where it expects to read from as you gave it - instead of a filename.
wget | apt-key \ / -> file ->
The pipe above isn't actually used at all, the data is written to a file first and then separately read from that file.
wget -> | -> apt-key
The data gets passed directly through the pipe from one command to the other with no intermediate file required (ignoring the fact that strictly speaking a pipe is also a file )
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