A few problems with using gold as a central feature for champion concepts

So I've recently seen a lot of champions that use gold as a resource to different extends. I've seen some that use gold instead of mana, some that deal bonus damage based on gold carries, either by the champion himself or the enemy champion and all of these champions have a major issue designwise.

When people design a champion with this as a core aspect, they usually realise that you can't do that with the normal income as you'd be itemstarved by using your spells. This usually means that the passive of the champion gives extra gold. That in and of itself isn't all that bad, seeing as we've already got a champion that does that ( and ). The first issue comes up when that's all the passive does. I've seen passives that was literally just a percent increase in gold gained. This is not interesting and a boring passive overall. So many other champions have passives that interact greatly with their kit or is essential to their kit, but just an extra gold percentage is very uninteresting. Another issue with this passive would be that no matter how you balance it, it's possible to either starve yourself by spamming your spells (if your spells cost gold that is) or you'd be able to keep on farming and have so much gold.

Now, it's probably possible to have a passive that works proper and then comes the next issue with a kit that revolves around gold: You're encouraged to not use your gold to buy items so you can use your spells proper. Even if your spells don't cost gold, they likely deal more damage the more gold you have or something similar, so buying for every piece of gold you have would SEVERELY reduce your damage. Don't encourage people to wait buying their items. "Should I buy this now or wait, just so I can cast my spells?" is not supposed to be a question you should ask yourself during the game.

Some people have commented around the block that maybe the gold generated should be a special resource (like Gangplank's Silver Serpents), but doing that would just make the kit interact with a special resource, not gold, defeating the idea behind the kit. (Atleast that's how I'd see it)

Now I know this is basically a rant, but every time I see a kit using gold, I always have the same critique and as so, I hope to reach a lot of people with this to make sure I don't have to write out the same things many times.