I was explaining to my family today what upgraditis is. At least to me. I started with 3 Sony HTiBs (5.1ch). I really only meant to get one but these were really cheap entry level ones which all had issues with the included AVRs at some point. Also, the speakers and sub included in each were both very small and nothing special.
The Yamaha HTiB that replaced the third Sony was a pretty good AVR with okay but, like with the Sony, tiny speakers and sub. At the time placement and calibration was terrible, as I did not know or care much about anything other than getting surround sound for movies, games, and TV with more power and loudness/impact than the TV's built in speakers. I just assumed running the room EQ program in in AVR would fix any problems with placement or setup.
In early 2015, I replaced my front 3 speakers with Sony Core bookshelves and center and the improvement was so great over the tiny HTiB satellites and mini center that I soon replaced the sub with the Dayton Audio SUB-1200 and surrounds with Cambridge Audio S20 mini bookshelves. I also greatly improved placement and setup with both advice on the forum and REW and eventually the MiniDSP 2x4 unbalanced for sub PEQ, which was well worth the effort.
In a year or so, I was so addicted to the improvement in both speakers and sub and placement/setup/calibration that I upgraded the sub again to my current Rythmik LV12R and front 3 speakers to SVS prime bookshelves and center. My Sony bookshelves became the surrounds (and Cambridge ones became rear surrounds after getting the 2070).
I knew that the AVR was the remaining weak link and so a year later got my Yamaha 2070.
The interesting thing is that the the biggest gains came in the first phase of upgrades, and with maximizing the setup. Going to the Rythmik sub and SVS front speakers was still a big improvement but not as extreme. The Yamaha AVR was a bigger improvement than I expected, but I did go from the RX-V375 to the RX-A2070 so aside from not going for the flagship 3070, I couldn't have made a bigger jump in terms of Yamaha AVRs.
At this point, I have decided that my audio upgrades are done for at least 5 years, and I will need to save up for a couple years to get a 55" OLED or whatever is best in a darkened room in probably 2020.
Even though, I am probably one of the more conservative members here in terms of upgrades, I still think often of how a could upgrade the sub, speakers, or even find better placement options in my room. I would say audio upgrades in the beginning stages offer huge improvement for small sums of cash and also there is a lot of improvement regarding setup because those brand new to HT don't know much about it. After that, one has to spend 2-4 times the money to get an improvement that is even remotely comparable to the initial stage of upgrades. And the law of diminishing returns becomes more and more applicable every time one upgrades their audio equipment.
So, it is basically an addiction and spending too much time on the forums tends to amplify that. :P
Perhaps the thing that keeps me from just enjoying what I have and not thinking about how to make it even just 5% better is that whenever you upgrade/tweak setup, there is a clear difference/improvement even if it is only 10-15% better or less and that feeling you get when hooking up your new toy(s) for the first time is really good.
Anyhow, my point is AVS is great for improving ones HT, less so for one's wallet or being 100% satisfied with one's current setup. Whenever I upgrade anything in my HT, my family asks what is wrong with the existing components and I answer nothing at all, it just could be even better. They sort of understand it after hearing the difference, but HT is not their passion so...
I have found the info in this thread in particular quite helpful at improving my audio experience and yet at the same time it seems to push me further down the rabbit hole. Kinda like a double edged sword or something like that