From the view of provider; I have plans to offer bulk rig management soon too. The biggest issue for big providers is management, when swapping from one algo type to another, changing description text on multiple rigs, and changing prices. This is manageable if having <5 rigs, but painful when having more. But even in this direction, we are already working on a solution and will soon be published.
Thanks for the quick answer. One thing to consider about the folks who operate big farms... I have no idea how professional (in terms of IT skill) they are in general, but I have a bunch of monitoring set up, keep a couple rigs out of my rental farm (and on one of the profit switching pools) as backup capacity, and my advertised hash rate is a little below actual anyway.
So although I get your concerns about reliability on a larger scale, it's actually the large scale that allows me to offer reliability because someone could steal two rigs from my house and I'd still meet my rental obligation.
Just food for thought. :-)