I buy loads second hand. Because I absolutely love a bargain.
It honestly brings me so much happiness, DM will say "oh that's a lovely dress DD's wearing today" and I'm; "Guess what!!!?? £2!!!!! eBay!!!!!!!!!!" like the Cheshire Cat.
I also then sell on everything once DC have outgrown it, often for more than I bought it for, because I take good pictures and press everything carefully. I genuinely think that all 3DC have cost me nothing to clothe, as anything new or specific like uniform will have been covered by small profits made from selling all their old stuff.
I've just got the £6k TV unit I wanted, from eBay, two years old, for £800. My dining room suite, is about £7k, and I got it for £250 because the chair pads were ripped and the seller had taken awful pictures. It's now all newly upholstered to match the new dining room curtains, which cost me £360. The Andrew Martin fabric I bought again, off eBay, the whole roll for £20.
Friends are always commenting that they don't know where all my money comes from. Our house looks lovely, with high quality items. I spend a fraction of what they do, buying their stuff all new from Next etc.
Cots, bookcases, changers, wardrobes, all solid wood, all from East Coast matching in French grey, make DTwins nursery look fantastic. I paid £80 for one set, £120 for the other, £45 for the bookcase, and had them all sanded and resprayed, for £250. To buy it all new, would have been £3850. I'll sell it all for at least what I paid for it when they outgrow.
Cars, holidays, buying a new home, we spend a lot on. But this is facilitated by the fact that 95% of things I buy are secondhand. DH has large salary, and had never lived like this until he met me. He can not believe how much we save and the misconception he had that secondhand must mean shabby or worn. He loves a bargain too now.