Nice post welly. Glad you got that out of your system
My errors over the years in no particular order.
Starting this hobby young when I was much more impressionable and actually believed the snake oil being served up all around.
Spent way too much on 'tweaks' that did nothing worth mentioning except make me poorer.
Believing that good gear would make crappily 'mastered' (an ironic description) recordings sound good.
Cables, biggest con evar!
Subscribing to an online music service... craptacular quality downloads.
Making do with gear that was readily available rather than searching out the good stuff.
Upgrade mods... mostly a waste of money that could have been spent on something better in the first place.
Buying stuff based on rep rather than listening to it first (difficult to avoid)
Taking mag reviews seriously, though not recently.
Buying CDs and finding I had bought 'censored' versions (Circuit City will never get my money again).
Getting married, it really crimps your Hi-Fi style
Listening to equipment rather than music... I'm better now