All
non-issues.  Small, uses relatively little power, and have you ever
 really seen a hub die?  I haven't, and I expect the one I'm using now to
 last forever. 
   Not really.  Try finding a spare power outlet in my Computer Room.  
 
The 4 port in my upstairs room has an adaptor that can draw power from
a PC keyboard connector.  Fortunately I have enough outlets that I don't
need to use it.
    And yes, I've seen a hub die.  Any one want a
dead hub?
   -spc (Running primarily 10Base2---not all the machines here have
        10BaseT connectors) 
Eric (Has far more machines with RJ45 or AUI than with coax connectors.)