At one point I may either open source my application so far or sell it for a moderate price in order to gather enough resources / make enough money to continue to the next level. Right now I need curated marketdata and reliable pricing in order to proceed with researching trading strategies. And I do pay $500 / year subscription for marketdata, and paid some $1000 for =~ 20 years of historical quotes. Only it's not very clean and making it so costs time and time costs money.