I am just curious what that is all about and will it count towards my shop profit?

The Subetateam will buy items out of user shops every so often. :)

And nope, as it does not go into your till, it doesn't go towards shop profit.

really sucks when you're going for til achievements and they buy 9m worth of stuff. D: but it happens every so often.

it's total rannndddoooommmm

They usually do it when item prices are really deflated, to add to what everyone has said so far. It stabilizes the economy.