Do you know what the difficulty will be in August when InnoSillicon equihash will have already been shipped and who knows how many Z9 will be already on the market
On Zec the current network hashrate is 500Msol with a difficulty of 10M (50Msol=1M in difficulty)
If 10k inno unit  (50ksol) and 50k Z9 (10ksol) are on ZEC (this is just an idea, and obviously not everyone will be on ZEC and the number of unit sold is pulled out of my ass) this will add 1Gsol to the network and push the difficulty to 30M
At that rate, a Z9 will give you 6.62$/day or 2416$/year. BUT, there is with figure pulled out of my ass.
I wish i could get proper sales figures so anyone could estimate because maybe the sales are 5 times that or a 2 time less.

Not counting an eventual fork that would transform the unit as door stoppers like the cryptonight ones...