I'm not sure either on the propaganda on man made live rock versus harvested. I just wonder with so much seeded diversity and bacteria from other people's tanks that is there much of a need for harvested live rock anymore?
I know the cycling will be quicker but is there that much more bacterial diversity from a harvested live rock than one you borrow from a other member's tank to seed your own dry rock? I argue that there may be a better suited bacterial population in the borrowed rock than the harvested rock as its already geared toward aquarium conditions.
I have no need or desire to buy harvested live rock anymore, even if I upgrade to 500 gallons. I'll just buy dry rock again and seed with my own live rock. If I didn't have any live rock, I'd just borrow a few rocks from another reefer and allow it to seed the dry rock. I know our hobby does have an impact on natural reef environments. Anything we can do to minimize that is I think beneficial. I'm not saying don't buy wildcaught fish or corals as we all still do that to some degree, but when possible, I try to minimize my impact where possible.