It would be like that if prices were fixed and if only one person at a time could buy ad spaces. But ComicAd doesn't work like that: you can buy an ad space for a set amount of time (e.g. 30 days for $0.01 a day), but if a second person comes with a higher offer for that same ad space (e.g. they offer $0.05 a day for 7 days), the space goes to them instead (person #1 who made the first offer doesn't pay anything during those 7 days). Person #1 can choose whether to raise their bid (offer more than $0.05 a day) to get the ad space back or leave it be. Every time a new offer is made, the base price of the ad goes up. In short: $0.01 is just the starting price, but if your comic site is successful enough and lots of people are constantly making offers to get an ad space on there, it can go up quite a bit
for reference, I'm pretty sure most button ad spaces on Kemono Cafe, which has around 32k daily views, started at a base price of $0.05 a day and then got up to roughly 10/20/50 cents a day as more people made offers.
I've been on ComicAd since March of this year with an ad space that costs $0.01 a day (starting price, current value is $0.04 a day) + 3 free slots in which people can offer what they want and got $7.38 so far
granted, it's not much, but again, mine is not a huge website by any means (especially now that my comic is on hiatus
)