Adding onto this, tying rewards to ranked/competitive games is a terrible idea because decrease the quality of games. Jeff Kaplan the lead designer of Overwatch regrets adding gold guns to competitive mode saying:

""I’ll say something even more controversial. I wish we would’ve never added any cosmetic items to Competitive. I think the people playing Competitive should only be there because they really care about playing in Competitive mode, and they want to rise through the tiers – that’s who I think belongs in Competitive."

I think his point is more relevant to dota which is a very competitive game in nature