Do you indulge when listening to your rig?

Single Malt Scotch (neat) usually MacAllan or Lagavulin. Sometimes with a really good brew such as Alesmith Speedway Stout.

I do find that a couch made from high quality leather seems to repel stains.

Absinthe Maktub if I have the extra money

On Sundays: A cup of Tea with a Drop of Milk.

Just for the record, and I'm surprised that nobody has mentioned this yet: Alcohol is a highly permeable neurotoxin that is carried by the bloodstream to all cells in the body, including the hair cells and sensory nerve endings of the inner ear. Even a single drink temporarily impairs hearing. This is particularly well-known to sufferers of age-related or noise-induced hearing loss and/or tinnitus.

Having said that, I frequently enjoy a nice single-malt while I'm listening, fully aware of the tradeoff I'm making.