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"needing to make a decent profit + taxes" applies to any sort of hardware sales business, not only cloudmining.
You make it seem like adding up all those extra costs associated with cloudmining will make it less profitable than home mining but that's just not the case. There are already several companies offering colocation at rates far below what the average home miner pays for electricity.
As for centralization, that's going to happen with or without cloudmining.
Unfortunately, this place seems to attract those without scruples.
Cloud mining sounds great in theory, but lots of operations have turned out to be scams. Even this one, AMHash, run by one of the "gods" of the Bitcoin universe.
Just as they say if you don't control your private key, you don't have any bitcoins, same can be said for mining hardware - if it's not under your roof, or at a cage in a data center that you have the keys to, you don't actually have any mining power, just the hope that whoever you gave your coins to will give some of them back as time goes by
The main problem with cloudmining is that it's based on the equivalent of a futures market, which simply cannot be directly run on a trust-less platform. It's just all too easy to keep the hashing, and exit scam with a bunch of coins and when enough people are involved, it seems statistically very likely that someone is going to be tempted by that scheme.
Now that's just basic cloudmining, like AMHash and others. The case for ASICMiner proper was a bit different because it made sense to ride investment for longer, as long as newer and better equipment kept coming or look like it could. Eventually, that died off and it went the route of cloudmining and exit scam (not sure who exactly was involved in that, but it most likely happened just like that).