The issue with investing your money instead of spending it on audio is that audio equipment inflation very likely outstrips the return on investment! The responsible thing is buy more stuff.
Fess Up How much have you spent on this Hobby??
Well, I've had the audio bug since I was a teenager and I witnessed first hand the emergence of high end audio as it was introduced in the market by manufacturers such as Audio Research, McIntosh, Crown, Revox and many others. I couldn't get enough of it and even went to Hope, Arkansas to meet Paul Klipsch in person. I (of course) had an analog rig for decades before getting into digital. I've changed out systems multiple times and have now incorporated HT into the mix as well. All told, I probably have spent somewhere in the neighborhood of 150K or more at this point... and really have no regrets!! Hard to imagine life without the world's greatest music. A blessing of the highest order!