SWMBO and I have a house which is too big for 2 but which was fine when the kids were young.
Thus, we have plenty of room..............and a huge risk of collecting crap.
Sometimes it comes in handy. Mainly it doesn't.
So, our rule for the last couple of years has been "Anything new in, something old out"..................works for clothes, shoes, (OK, it works for MY shoes), IT stuff, furniture, etc etc.
Currently awaiting disposal in the garage are 1 old pc, (I keep forgetting to take out the hard drive to smash it up), 1 old M & S sofa, (pre-fire regs, so no good to charities) with added special effect paint marks all over, I old Nokia and I GalaxyS. Last week's trip to the re-cycling dump and shop made me feel very virtuous....... If in doubt, dump it............
(I've just come back from borrowing a friend's car ramps - I dumped mine in an earlier clean up.....)