I like them in some games (Kingdom Rush, TF2) but in other games, I hate them (Clash of Clans and all other Supercell games)
In KR and TF2, you get to keep what you bought forever and what you got will almost certainly change the game drastically.
In Coc, you buy gems and waste them and get nothing out of them.
In KR and TF2, the prices are relatively cheap (well, KR it's a bit highish) but in Coc, it's as expensive as golden dirt.
Also, whenever I buy an in game purchase in KR or TF2, I feel happy about my purchase. Quite the opposite for Coc.
What about you guys?
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