How many people here generally buy used?

Used and broken. Me fix, me fix. Cheap cheap.

Like a crack head, like a tweaker...how much audio can I buy for my $43 of crumpled bills?

As much as I possibly can.

So, make some aspect of it myself, and just buy the ingredients.

Thus, buy busted ....and fix it.

Importantly, I’m going to mod it out anyway, so buying broken is just one tiny step further down the road that can lower the ’in’ price by +50%, if not 80% or 90%.

Like Sun Tzu, I wait by the river for the body of the given audio gear to float by... and eventually it does...

Id prefer to buy used, preferably off of a place like Audiogon. 
I ended up buying my integrated amp and speakers new from Audio Affair but bought my OPPO 105 used here. 

Many dudes!!!!

Used mostly, new if cannot obtain used or if contains newer desirable technological advances like digital components.  

It's rare for me to purchase used equipment.   The predominance of my system was purchased refurbished or close out.  Like new at 1/3 less sometimes 1/2 price.  8 speakers,  pre/ pro (twice),  turntable,  and power plant.