Do you buy gear new, used, both?

Both

for my “A” system, it’s all new for hi-end electronics and speakers,, but the hi-end cables loom were purchased pre-owned because of MSRP adverse resistance.

for my “”B” and “C” systems, it’s a hybrid too but a significantly more pre-owned share ,

Mostly used for me.  Generally, from TMR and other audio shops that stand by their preowned offerings.  Couple new or almost new pieces.

I am king of the open box!

I go both ways.

(Insert humorous response here)

Due to available finances, I can only acquire components of a certain quality if I buy used. Luckily, there usually are a lot of options on the used market and I am always willing to wait for the right deal.

That being said, I do occasionally buy new, such as recently purchasing a Denafrips Iris DDC, but this is rare.

My primary system is mostly used except for the turntable, cartridge and all the cables. The HT 7.1.1 system is mostly new except for the subwoofer, center channel and front speakers. The third system is all new (old repurposed receiver, old CD player, old turntable with a new cartridge, and new KEF speakers). 

The primary system is mostly higher end stuff. The only way to justify purchasing it was with deep used, or demo discounts.