Hello! Thank you for your comment!
Yeah, it's true that not everyone would be able to buy it only on itch because of the price, which Steam solves by converting the currency. The problem is that Steam also adjusts the currency for the developers... and that really messes up their sales (T＿T)
For instance, let's say that an Argentinian developer wanted to sell their game for around 15 USD. In Argentinian pesos (according to Steam's exchange rate) the game would be selling at around 256 Argentine Pesos. 256 Argentine Pesos is 0.90 dollars, it's not even a dollar. That's why it wouldn't be worth it for me at the moment to sell games on Steam, unfortunately, even though I really want to ಥ_ಥ
The alternative I'm thinking, in addition to selling the game on itch, is to also sell the game as a reward on my Patreon, since Patreon has more paying methods than Itch.