Which stuff loses the most when you come to sell it, high end or budget gear? I picked up a year-old CS strat for £2.5k which was something like £3.8k new. That's a big kick in the teeth for the seller. Same model is now £4.2k with the latest price hikes.
Higher priced stuff for sure ... as a percentage it's kind of the same often but obviously the higher the price the more money that percentage is.
My mate just bought a mint condition 70's vintera Jazz bass, retail is almost a grand, he paid £600. ... so that's basically a 40% loss for the seller. ... but it's only £400 loss compared to £1700 on that CS.
The answer is that new stuff loses the most money, if you buy used at a decent price you'll probably never lose money and it doesn't matter. If you buy new, you are almost always going to lose money when you sell it.... unless it becomes rare or collectable for some reason.