Bike wise I buy SingleTrack every now and then. I'll have a look through the others and if anything interests me I'll buy it.
I have subscriptions with Motorsport (and have probably got every one from about 1979 onwards and a few before), Octane (again have every one since it started) and also Classic and Sportscar (500+ copies) Always buy RetroCorse when in France and would like to take out a subscription but my Francais est Tres Merde.
Sometimes buy music mags (for holidays and flights as they always seem the most appealing thing on airport shelves) and have bought the odd pie-in-the-sky mag- you know the ones 'Dream Houses in France' 'Gardening for Knobheads' 'French Cottage Fettishist Monthly' 'French Country Living Incorporating Horse and Hounds Bi-Monthly'etc. in the hope the wife picks them up and decides to do the sensible thing and move to Loire valley chateaux. Alas not much luck on that front