In your table above, I disagree with your USD per BTC column. (When I made my first post I made some very conservative BTC price estimates that have now proved to be unrealistic.) In July the price is more likely to be $3,000 USD instead of $2,200 USD.
Further out projections for USD per BTC have BTC prices at $5,000 around September 2017 and $13,800 around February 2018.

Here is a link that build the case for BTC price progression

By February 2018 your chart has the difficulty going up approximately 2.36 times. Yet the price expectations are for a price increase of 5.52 times. In this case the potential payout in USD should keep ahead of the difficulty increase.

Thus if the price appreciation stays ahead of the difficulty increase rate, the contract is likely to do well.

I do agree that the Ethereum contract is likely to do well.

For the Genesis Mining X11 contract, I have recouped the USD I put into it in much less than 2 years. Unfortunately the X11 contract is not available for purchase from Genesis Mining at this time.

Everyone should keep in my that any investment has risk and cryptocurrencies including mining contracts are speculative investments. Much research and self-education should be undertaken before making an investment.

Hive account@mkaya, very good post!

I am currently focusing on BTC mining and recouping my original investment well before the next halving event in 2020. For this reason I will stop purchasing BTC upgrades in September 2017. The only reason I can think of that will change my mind is a BTC price rise that even blows away my high expectations.

Thank you for alerting me to your post.

Have a great weekend!
Steem on,
Mike