Kleptomancy should have diminishing returns or a soft cap

It seems like Kleptomancy is actually very snowbally because you get so many more opportunities to proc it. But when even or behind I don't think it's totally broken. And certain champs, we all know who, proc it so much more easily.

So what if it was just straight nerfed? Well it might remain viable on like 3 champs because they abuse it so hard that it can't be any stronger than that. That would be pretty dumb. A keystone that only 3 champs can use.

So instead, how about this. After 300 gold has been earned, the amount of gold per proc is 2 instead of 5. And then after 500 gold, it's only 1 gold per proc. This way, those champs who synergize best with it will be able to rush their first item faster but they will experience diminishing returns sooner. Other champs who kinda use it decently will still be able to use it because in most games the diminishing returns would be of little consequence to them.