I agree and I mentioned that in the other thread (Feasibility of datacenter farming (and the risk of farmer centralization)).
Yes. But because anything that’s not cold (in terms of MaidSafe’s caching algorithms) should be served by the caching layer, farmers won’t see most of that action (they’ll see 1/4 of the first cached hit and then nothing until cache expires and gets requested again).
Personally I plan to use MaidSafe for off-site backup of my data, so my private content will (hopefully) be requested precisely 0 times.