a lot of over priced electronics, custom furnishings, wood work, etc.. the essential (albeit high end) components to view hdtv/dvd/bd probably cost 75-100k, tops. not that impressive, just some rich fuck with money to burn. sorry.
Not really, high end components can easily top out at $100K each.
A Trinnov processor, for example, 32 channels can easily run $50K for the unit itself. They make 16 channel versions that average around $20K. This is the processor only, (This is measured in channels - your 7.1 audio is 8 channels, for example, so 32 channels give you standard 7.1 channels plus 24 additional environmental channels for Dolby Atmos or DTS:X processing.)
Then you need 32+ amps for all those channels, which can range from hundreds to thousands each. Let's say another $16K ($500/channel). Then there's the speakers, which can easily be thousands to several hundred dollars each.
And that's just audio, nothing fancy, just high end equipment, which if you estimate it out will probably be about $150K or so. A good screen and projector, can top $100K easily - using proper digital theatre projectors, not dinky little ones you find everywhere.
The players are cheap - trivially so - maybe $5K if you fully outfit yourself with a high end Blu-Ray player ($1K), dozens of other sources and a matrix switcher that goes every which way.
Then there's the huge labor cost - aligning and setting up, and even more importantly, integration. Creston and other integrators are expensive, so it's probably a quarter million for the equipment and installer to get it all hooked together and working as one cohesive unit.
Wonder if the IMAX personal home theatre ($400K) includes options for Atmos and DTS:X processing when you're not using IMAX...