just buy ads on youtube, google adwords and etc lol
I totally agree! In business, you need to spend money in order to earn more money, of course.
You need to spend money as capital,but of course you need to assess if your profiting.
i have been into business for years now and i am sure this is not an easy task if you don't know what kind of business are you running.
Also, include Facebook and other social media, depending on your mobile application game's demographic and target market.
social media is profitable now specially youtube in which the more you have follower is the big income you may get.