I don't think any of these companies price their products properly. Why? Cause people used to buy them for 10k+ no questions asked. Now? Everyone is buying out or trying to milk it.
Avalon6 is overpriced. Won't doubt it if the S7 lite price makes people think twice, too.
People accept the 4month ROI. It's easy to price everything accordingly.
Their target market are people with established and profitable rigs looking to upgrade in bulk not people trying to buy one for fun or hobbyist who view this as a lottery attempt. You're better off taking your cash to the actual lottery unless you're shelling out at least 5k.
Your forgetting price of BTC during some of the purchases. Like when I purchased my dragon at the time I felt i spent a ton on it.... but BTC was worth a good amount so it seemed fair. But miners were not cheap during start of asics.
It was 3 month ROI on most GPU rigs... and that ended and time is now much much longer to ROI.
Also power has changed it's moving more twords what I call hobby mining. It's getting more and more where you need a area for miners. With them getting bigger, louder, and more powerful it's hard to slap one in a room anymore.
Things are changing. I think hobby miners will do fine for foreseeable future, home miners wanting to put in a room they use going down in numbers.