This has always perplexed me. You could hire a junior on say 10,000 credits who could produce 10 units of work per week. You could then hire someone more experienced, on 25,000 credits, but they could produce 50 units of work per week. You could then hire seniors and pay them 40,000 credits, but they're producing 200 units of work per week.

Why is it fair to increase the wage so slowly? Either less experienced developers are not worth the money to begin with or someone, somewhere has an idea of what the max cap of a developer is, and sticks to it.

It is really hard to measure developers productivity and nobody knows how to do that with a good precision. But in general I agree that top developers should be paid good money, like 2 times less then CEO.