From the insights above, it sounds like all you need is to choose the largest Google Ad possible, post it, then sit back and wait for a flurry of conversions.
Well, we have bad news for you. It’s not what it actually looks like. A large ad is not all practical and can be counterproductive to some extent for certain ads.
Google Ads has an inventory system to determine the space available for posting ads. However, this system tends to favour small and medium ads. Therefore, there is quite a limited inventory space for larger Ads, and that’s so for a reason.
You can’t be bombarding readers with gigantic ads all over the place. It’ll definitely be annoying, and Google has to control that.
Hence, the trade-off is that with large ads, an advertiser will have a high click-through rate (CTR) but lesser reach and placement diversity.