For example, if you would sponsor a game for 10k robux, and it gets 10k visits, and then you sponsor for 100k robux, would you get more than 100k visits, or is it a linear growth?
Ad space is not directly purchased — instead, space is bid for in an auction format. There’s a limited amount of ad space available, so ads with higher bids get more impressions (displays).
Imagine there are 3 ads in the system (there will often be hundreds):
Ad Bid Amount Result A 300
The ad will appear three times as often as B and six times as often as C . B 100
The ad will appear twice as often as C . C 50
—
You likely won’t.
Let’s say there are 1,000,000 pairs of eyes on the Games page. There’s already 100,000 R$ bid on the ad market at the moment, meaning 1 R$ is 10 impressions.
If you sponsored with 10000 R$ (and all the impressions became visits), you would get
1000000 / (100000 + 10000) * 10000 = 90909
visits.
If you sponsored with 100000 R$, you would get
1000000 / (100000 + 100000) * 100000 = 500000
visits.
That’s a 5x increase in visits for a 10x increase in R$ spent. (edit: depending somewhat on how much R$ is already bid and how many people are already bidding)
(P.P.S:
You also have to consider that coming up too often will make people ignore the ad. If not a single other soul was bidding, you could get all 1,000,000 impressions on your ad with one R$, but they will probably get sick of seeing it on every Sponsored slot.)