today i made about 1.5k in 4 hours botting so 5k is pretty doable
Well... that's a common misunderstanding.
In x amount of hours you loot enough amount of materials to gain 2k (considering you know the price already of every material you've gathered).
When you actually get to start selling them you won't end up with EXACTLY 2k, it will be either higher or lower.
We're not dealing with constant values. Prices change every minute. just because you made 2k from selling x amount eternals doesn't mean that if you sold the same amount the next day you'll also make 2k.
And also, just because you think in 4 hours you gathered enough materials to make 2k of gold doesn't mean that if you gathered for 8 hours you'll have enough to make 4k of gold.
There are quite a few variables to take in consideration.
You could gather the same amount of loot in the next 4 hours or gather more or even less.
The prices could be higher or lower.
Possible competition.
Dumb botters who flood the AH with all the materials they gathered the past week.
It's all "estimates".
It's just that most people talk about their highest "estimates" rather than their minimum or average estimates.
That's how i see it anyway
