Got back into WOW last week after 6 months away - and it suddenly got me thinking.
For the last week I have pretty much just played WOW, no other games really. During my 6 months away from WOW I bought a bunch of other games, some of which I played through to the finish, and others that I got bored of pretty quickly.
Even after having paid the WOW monthly fee, I'll be buying less other games than when I am not playing WOW, so on balance I think I'll actually save money playing WOW .
I would not say I'm spending any more time behind my PC than before, but it is costing me less in terms of games purchases thats for sure.