It should give coins whenever it do not give gem according to this code:
Code:
new int[] {1617, 1619, 1621, 1623, 995}
Will buff the experience as it seems like a old overlook. Unsure why they did not consider it to be a good stall as it's respawn timer is long.
Aka experience is 2800 atm and other stall is 5k which seems not right.
Will come in a future update.