As with others, many of the questions are a bit ambiguous and difficult to answer without a better idea of what the rack looks like or how it functions, especially relative to any other ceiling mounted rack/lift on the market. And, also as mentioned, many of the features listed would be nice, but price comes into play.
I currently have 5 or 6 bikes at my place, 4 of which are mine. At any given time though the number can be has high as 8 or 9. Having the rack scale well is important, but price is a big factor. Most of the bikes get parked in the garage, next to the riding mower and lawn equipment. I don't park a car in the garage because it also doubles as a workshop so space is at a premium but with 14' ceilings, elevated storage has been something I've contemplated for a good while now.
The biggest problem is ease of use. I'd only be storing the bikes that I don't regularly use on the ceiling unless it was almost stupidly easy (and fast) to get them down safely. And those three things don't bode well with keeping it financially reasonable. The bikes I use regularly (nearly all of them) are stored either leaning against the wall or by their kick stands - or are being worked on so they're on the repair stand. If it was super easy and quick to use though I'd store them out of the way and maybe be able to fit my car in there.
Just nit picking but that's kind of how I saw it.