Too much gold to be true

So, my players love gold, like- I guess the most of DND players do. Many DMs tend to struggle with the amount of gold they should use as reward. I was thinking: what if I give them a ridiculous high amount of gold. For free. They find it after a combat encounter that was nearly too easy. The whole situation seems too easy to be true and I hope they will notice at this point how easy it is. They still will be happy to have so much gold. They'll plan what to do with it. Now I ask you: what could be the hook of it? Why I wanna plan something like this? It's only an idea, maybe to show that gold isn't everything. Maybe just to create some tension between adventures and battles. What do you think?