How I imagine the SR shopkeepers are like once you buy a full item

If i was the shop keeper... I would buy infinity edge with all that gold

Nah. They're probably only allowed to keep like 10%.

The rest goes to Riot.

How I imagine the SR shopkeepers are like once you buy a full item Zhonya's Hourlgass

FTFY

I wonder how much gold has been spent in League of Legends, and how much of that has gone to the Red(/Purple) side and the Blue side.

I'm waiting for the shopkeeper to just equip 100 of every item and storm onto the rift (and then die to vayne+fiora)

Riot should make a chart with the total amount of gold spent by both red and blue teams on all the maps.