The idea is intriguing, though the discussion seems to have denegraded.
There is no valid reason why it can't be available. Many companies sell Tanks, Stands, Hoods, Sumps. Usually bundled with useless (for reef) lighting. Make no mistake, this won't be cheap, especiall if you want quality.
No reason there can't be a few options available that make the standard Tank, stand combo making the system a turn-key reef system.
W/Hood offer a premounted 2xmh, vho reflector mounted inside. Popular combo... Just add 800? to bill
Reef Ready should come with prefitted plumbing to included sump in the stand, and Plumbed return pump of appropriate rating. Shouldn't just mean an overflow in the tank. 500?
Offer a decent in sump Skimmer
Sump would include mounting bracket for probs (bought separately), Heater (maybe sepearately). 250?
Option for Calcium reactor...
So the 30$ tank, with Stand, hood, lights, sump, pumps, skimmer etc. would now cost 2000$
It was a lost leader anyway, but don't worry there is still the ro/di, top-off, uv, controllers, bulbs, livestock, test equipment, ozonator, powerheads, wavemaker, books, additives, salt and...... to buy!?!
Still a good idea, buying just a tank, is kind of like buying a car without anything under the hood and no tires or transmission. I am no car engineer, I would hate to have to pick out all that stuff with the salesman, Though where choice should be given, there are enough options availble to make that 20K car 40K. Should be the same with aquariums, though much of it is packaged together by the lfs, companies like Oceanic, should consider more complete offerings.