Here's a bit of statistics:
- 2 weeks of vending
- People earning gold off my tank, while I get 20%
- 1 Donation (4k, which I was grateful for)
- Luck with the Poseidon's Legacy (got one, fled and got Sharktooth)
During the whole quest, I never played a single game of booty grab, and my store transactions went for 320 million to 353 million. All in all, I'm probably never going to quest for anything costlier than this.