This page hosts a curated list of useful data for lane-pushing game developers.
Publicly Available Market Data
|2018||Newzoo||Esports Report||June 2018|
|2018||Newzoo||Global Games Market Report||June 2018|
|2018||SensorTower||Q1 Data Digest||June 2018|
|2018||Appodeal||Monetizing Casual Games the Right Way||May 2018|
|2017||EEDAR||Awesome Video Game Data||Jan 2018|
|2017||SuperData||Year In Review||Jan 2018|
|2015||EEDAR||Esports Consumer Analysis||Nov 2015|
|2015||EEDAR||Deconstructing the Free-to-Play MOBA Market||Nov 2015|
|2012||Riot Games||League of Legends Infographic||Oct 2012|
Most of the above reports are "light" versions, with full versions available to purchase for several hundred to several thousand dollars. Do check in on the various suppliers as they may have more recent data available.
|2018||Ischacht||HotS Survey||May 2018|
|2017||leafeator||Dota2 Survey||May 2017|
|2017||Quantic Foundry||Female Gamers in MOBAs (10%)||Jan 2017|
|2016||Aconceptthatworks||Why People Buy Skins in League and Dota2 (Masters Thesis)||Sept 2016|
|2016||GwelsHeroes||HotS Census||June 2016|
|2016||GwelsHeroes||HotS Census||Jan 2016|
|2015||leafeator||Dota2 Survey||April 2015|
|2012||Ninsha||League of Legends Survey (Google Docs)||May 2012|
The above surveys were found by searching through reddit for general-use statistics. They are all biased towards reddit's demographic, and the timing of a survey can affect results (such as the 16-22 age range typically being occupied with exams in May/June).
Found more resources? Let us know!