That is the same question I posed with my post about the use of extension cords on one of the other forums - "When is temporary not temporary." I think it's in the General Discussion forum.
I normally use use these stupid things out necessity. Here at work, I have only one duplex receptacle in a doghouse under my desk.
I have two such power strips:
First one powers my computer terminal's CPU, monitor, speakers, printer. That's all one strip.
The second one shares a triple tap (more on this in a second).
This second socket strip powers my wall clock, my two radios , and the transformer for the speakerphone's power supply. I don't use both radios at the same time - the reason I have two is my original one has a cassette player and the other was a Christmas gift (it's a CD/radio combo so I could play my CDs at work).
Now onto the subject of the triple tap. The other item plugged into the tap is an extension cord powering my pencil sharpener and my time-stamp clock.
So in total, I have 9 appliances plugged into a Nema 5-15 duplex socket.
Most of these devuces are very low wattage and don't get used regularly. Still, I wouldn't mind a second pair of outlets....but by the time I found out about it, the floor was laid down, it was too late.
Sure, there are other around the room, but they're all covered by boxes of merchandise, One of these powers my box fan at the far end of the room (through a heavy-duty 14-gague extension cord with a right angle plug because the fan's power cord was not long enough to reach it!
I haven't blown a fuse...yet.
This is nothing. I've seen other people's desks where they've got triple-taps plugged into the outlet strips because they need more sockets, more sockets!!!!
And this is in a 1960s-vintage (modern) office tower (#1 Chase Manhattan Plaza in New York City's Financial District) that's supposed to be up-to-date -- entire floors getting gutted and renovated for new tenants who move in.
We seem to be very short on wall sockets!