Seriously though, the cost of buying one GH gets cheaper over time, because the expected return of 1 GH decreases over time. I don't think both have decreased at the same pace, mainly because the value of a Bitcoin relative to fiat has fallen.
Ah, so 60Gh in May cost .288 Btc but now costs .096 Btc. That's a decrease of about two thirds. However, the weekly payment is now about a third of what it was in may. Still sounds like treading water.