The optimum strategy would be to get to circa 45% of the network as fast as possible, since speed is the key. Then sell any chips that can be sold, but keep enough to ensure that the capacity can be maintained at 45%.
In terms of chip value, clearly in BTC they will only go down over time as the coins they can mine going forward decreases and the price they'll achieve at volume sales is unclear. However if BTC keeps going up then the profits in USD can keep increasing.
I think people will be less likely to pay extravagant sums for a Blade if the hashrate has been significantly increased. You're better off selling hashrate until it's no longer quite as profitable, then start mining.