I went on a home audio kick a few years back. I got the Sony HTST7 in my bedroom for $700 on clearance open box at Best Buy back in 2013. The HTST9 in my living room was a grand on eBay in 2015 and the Sonos Playbar I have was about $500 last year open box which I plan to replace the Sony in the bedroom with. I hate those Sony soundbars because they cause interference with my router on the 5GHz band. One of these days I'll get rid of the HTST9 and replace it with a Bose SoundTouch 300.
Also in my living room I have a Yamaha RX-A1020 receiver with 2 Polk Audio Monitor60 Series II fronts and a CS2 center channel as well as 2 Pioneer Andrew Jones bookshelves and a Pioneer 10'' sub. All that stuff together cost about a grand. I'm usually using the soundbars to keep the noise down for my neighbors. When I move I'm gonna dump that receiver for one that's more up to date and get better bookshelves and a sub. Probably all from Polk to match the series.
My problem is with all this equipment there's no good place to sell any of it. Once you buy this home theater stuff it's effectively worthless when it comes to resell value. I just had to take an old TV to the pawnshop because I couldn't move it elsewhere and I sold it for $80 but back in 2012 it cost me $1500. Granted I know it's an old 46 inch 1080p set but I sold it for 5% of what I paid for it.
Most if not all of the time you will take a hit on AV equipment, unless its something that is rare, limited production run. All my old equipment I have sold to friends for a fraction of the cost.
I'm in for a few grand paid for my home theater, insured for $15K. I picked up an Onkyo TX-NR3030 11.2 Channel Dolby Atmos Network AVR , a pair of Energy Veritas 6.3 towers, Energy C-C1 center, (4) Energy Take 5 satellites on the ceiling, Energy C-R100 bi-poles on the sides and rears, and a Velodyne VA-1215xII sub. This is all setup as 7.1.4, video is a Samsung 4K UHD BD player, and a Samsung KS8000 65" 4K set.
I have 2 other rooms that have smaller setup, pc room has Energy C7 Towers, Velodyne VA-1012xII sub, Sony AVR.
Bedroom has Energy C2 bookshelfs, Onkyo AVR, and another Velodyne VA-1012xII sub. Samsung KS8000 49" 4K tv with Samsung UHD BD player
Energy was one of the best sounding speakers when they came out, Klipsh bought them out and killed off all the hi-end and reference line, the Veritas I have was part of the reference line. Couldn't pass up a deal.
I think the only thing I may move to is upgrading the 65" to a 75" or 78".