Your suncontract coin will be highly volatile and useless for the real contracts, because if you want to deal with middle or long term contracts you need very low volatility in currency.
Why don't you use good known cryptocurrency with low volatility like bitcoin, which will be perfect after SegWit implementation?
That's a valid point and we're exploring several options to address this. Nothing to worry about though, as there are many solutions. We're also thinking about fees in the Ethereum network, etc.