I purchased a 10 H/s mining contract from Genesis Mining last night. Highly speculative and risky venture, but I had some extra Bitcoin just sitting around and figured it will be an interesting experiment. Given the recent interest in Monero for similar privacy reasons, the high expectations for Zcash do not surprise me. And with its similar characteristics to Bitcoin regarding coin supply & mining rate, combined with relative scarcity at the start, I agree we can expect a high initial valuation which will probably decrease as sellers gradually bring their coins to the market. But the high price might remain propped up longer than we've seen with recent coin launches since everybody has to mine the supply first.
I've heard that both Kraken and Poloniex will list ZEC from day 1. Which kind of surprises me given it's going to take a long time for any sort of decent depth to build up on the order books. The first few lucky sellers will be able to command ridiculous prices, I'm sure.
If you are mining Zcash, the sensible strategy is to sell as much as you can as fast as you can. And if you are not mining, the best thing to do is sit on your hands and wait for the price to stabilize. Don't buy up the initial thin order book no matter how tempting it may be.
And I actually don't mind the slow mining start. Genesis Mining added a free extra month to their contract to make up for that. And maybe it'll scary away some people after the first few days, leading to hash rate dropping off and a bigger share of the mining pot for dedicated miners in it for the long-term.