Diminishing return=one more x than necessary

Diminishing return. OK then, you asked for it.

Being an audio engineer in the 21st century. Investing in new technology equipment that turns out not to be widely adopted by others. Spending $40,000 on a college degree to learn what bad acoustics are, how to move a volume control, how to play with software like it's a computer game. Fixing old Yugos. Owning jaguars (the cars not the cats). Driving your car too fast all the time. Running red lights. Chinese condenser microphones. Beringer equipment serviceability, longevity. Incandescent lightbulbs. Analog multitrack tape. Expensive PCM converters because they are still PCM. Digital microphones that aren't. Digital consoles with lousy equalization coding. Touch sensitive faders. Transformer less microphone preamps/consoles. Doing business with Bernie Madeoff. Facebook. Twitter.

Oh & a Neve/API equipped Remote Truck.
Mx. Remy Ann David

It occurs to me that once certain conditions are met in your studio/gear setup, further investment begins to return only incremental results. For example, creating a favorable acoustic environment (room & treatment) made a huge difference in the quality of my recordings, as did acquiring pro level mics and preamps and the skills to use them.
But improvements beyond those begin to have less dramatic effect. For example, i could upgrade all of my cabling at no small cost, but would likely see only a small difference in the resulting recordings. Or I could invest in yet more microphones (I already own over 30 good mics), but none would give me the increase in quality I got when I purchased my first pro-quality LDC (U87). (This fact won't stop me from buying more mics!).
So, once you reach a certain plateau with your studio, the improvement/cost slope begins to level out. But if you're like me and suffer from chronic G.A.S. the improvements, even if relatively incremental, must go on!

My mic & equipment list can be found on my website.

Jeff