I think its important to only use CHA as the only base currency...concentrate on making a fast, easily accesible interface and users will naturally acquire CHA to participate...diluting the demand for CHA by incorporating BTC is a mistake you are about to repeat already made by the Counterparty devs. Look at their awesome innovation yet compare their market capitalization to Mastercoin's
This is actually a bad example because right now if you look at coinmarketcap Counterparty has
bigger ROI than Mastercoin.
[You need to remember that mastercoin crowd sell was in July-Aug sending a total of about
5000 bitcoins worth about US$500,000 at the time. Counterparty burning bitcoins was in Jan-Feb 2014 and about
2,130 bitcoin worth about US$2,000,000 were burned.
Meaning that mastercoin started with more than X2 marketcap than counterparty.]