Good Guess Bobby M. haha. Everyone in my house loves the homebrew. In fact I have converted 3 of my brothers to the lifestyle. People keep asking to buy 6 packs and they go way too fast. I think I might try the Rubbermaid tech.
It sounds like he's brewing extract which means he can easily do a 10 gallon concentrated boil and top up to 30-40 gallons. Man, that is a LOT of money in malt extract. If you're doing that much volume, all grain brewing and full sacks of malt is really the way to go.
Certainly can work. Just make sure you work out the logistics before starting.
How will you fill the fermenter?
You won't be able to move it once full.
Think about racking to a bottling bucket or secondaries.
The fermenter will have to be sitting higher than the target container.
You'll have to make you own siphon to reach the bottom of the container or add a valve.
I'd probably just take the easy way out and get a bunch of 6.5 or 7.9 gal buckets. Much easier to manage. Plus you can have multiple brewers "own" the fermenters to prevent any concern about breaking the homebrewing restrictions of 100gal a year per brewer.
Also what Bobby_M said about AG. At that kind of volume it won't take long to pay for the AG setup.