Microtransactions
Thou Shall Allow a Path to Earn All Items Through the Sweat of One’s Brow
Thou Shall Not Allow Payment to Equal Unmatched Advantage
Thou Shall Utilize Clear Pricing Policies
Thou Shall Not Design Games Around Paying to Save Time
Thou Shall Focus Mostly on Cosmetic Upgrades
Thou Shall Price No Virtual Item Higher Than Its Real World Equivalent
Thou Shall Remember Not Every Piece of New Content Must Be Sold, Rather Than Given
Thou Shall Make It Obvious When Money is Being Spent
Thou Shall Not Decimate a Game to Make It Free to Play
Thou Shall Not Completely Abandon Cheat Codes
http://www.positech.co.uk/cliffsblog/2013/11/24/strategy-games-pricing-and-the-enjoyment-curve/
http://www.pixelprospector.com/the-big-list-of-game-revenue-sales/
http://www.pixelprospector.com/the-big-list-of-postmortems/
https://www.engadget.com/2018/04/03/mightier-mobile-game-platform-kids-calm/
Diablo:
https://www.youtube.com/watch?v=tBxcLgxYLaM
https://www.youtube.com/watch?v=4D_bVgplit0
Five key trends shaping the future of mobile games
https://www.youtube.com/watch?v=9V0PJ-bwUio
https://gamedev.stackexchange.com/questions/150780/what-are-good-alternatives-to-microtransactions
https://www.cnet.com/news/micropayments-mega-angst-and-the-future-of-console-games/
http://www.ign.com/boards/threads/alternative-to-microtransactions.453585887/
https://www.gamasutra.com/blogs/SinaShahbazi/20180401/315886/Postmortem_Amazia_a_CCG_for_mobile.php
Resources
https://plarium.com/en/blog/truple-a-games-microtransactions-loot-boxes/