Asset Forge is worth every penny, as is all Kenney Assets (I've purchased each and every one, though it wasn't necessary). I am no artist! I'm too technical for that... I need the wonderful efforts of people like Kenney.
For those offering to pay for an upgrade, I think you'll find Kenney won't do that (from my experience), but that does not mean you cannot donate more money to him. There is nothing wrong with becoming a patron.