Making Rune builds more varied and useful

So I was trying to make a gold income rune build, and it's just totally not worth even 4 slots at the current gold income per second for tier 3 runes. This really needs to be quadrupled possibly and in general, it makes rune builds not dynamic if everyone is running the same rune builds because there's too much of a loss or benefit on running powerful versus weak runes. Maybe make gold income runes incremental, so the more slots you are willing to sacrifice attack power/ cooldown/ armor/ magic resist for gold income, then it makes it more worth it to run gold runes for income.