To be fair, he didn't ask for CPU recommendations - he says he wants a 9900k and didn't ask to be argued down to an 8700k or 9700k.
So if someone is clearly making a decision based on flawed logic and states they can barely afford the chip, let alone a decent cooler, you think it's better to just ignore the obvious problems and not offer better help/advice? How about when someone is looking to self harm and asks where's cheapest for razor blades?
Op, it really sounds like you need better sources of info, why not post a proper spec/usage thread in the upgrade forum with a budget and get some decent advice for your usage?