Do you buy new, used or new or used gear?

Not only do I normally buy used but I keep my gear for a long time, because I buy good stuff that I like (not a reviewer). My core system is 35+ years old and plenty satisfying and easily takes me away to a nicer place. I just can't listen to any newer high-end stuff because that WILL show the deficiencies and interfere with my journey. A few years ago I was stupid enough to let a friend put his new 10k+ interconnect in and, ever since, I've lusted for that sound again. Unfortunately, that interconnect alone costs many times the total cost of my system and is neither cost-effective nor in any way affordable. Gotta dream, though!!!

For my primary system, I bought used Moon 700i when new North Collection came out. Used Vandersteen Treo CT speakers, used Mola Mola Tambaqui Dac, used Grimm MU1 and new Nordost cables. I built my Roon server.

My second system was all new, Peachtree Gan400 amp with preDAC and PS Audio AirLens and Laiv Harmony Dac with Ascend Acoustics Sierra Towers w/RAAL

People have upgrade fever and I bought my used system for around 60% of MSRP in mint condition. When I sell them, I will not lose much investment money.

I like factory certified or new old stock.

Either depending but need to be careful dropping big bucks on used gear. 

I have both. Buying new and used, selling, trading, upgrading.  They’re all fun parts of this hobby.