I don't think that's the whole story. Most likely the numbers just don't add up for IAP-less Steam versions. Kingdom Rush Steam sells for $9.99 (and was availab

I don't think that's the whole story. Most likely the numbers just don't add up for IAP-less Steam versions. Kingdom Rush Steam sells for $9.99 (and was available for less if you pre-ordered). I don't know about Origins, but Frontiers has obscene IAP price-wise. Purchasing all heroes costs $40 or so, plus there is always the opportunity to buy gems for items which make it easier to progress. (Gems also accumulate as you beat levels). In fairness, this is all optional and you can beat the game without it. They kept adding increasingly difficult post-game levels though, which no doubt have tempted many to buy stronger heroes. PS. I think they should fix the bugs in KR Steam first anyway, which was pretty much abandoned.