@garyvee says, it’s all about attention and where you can get it underpriced. In other terms: check out where your potential clients spend a huge portion of their time – if you can get part of their attention there at cheap prices, go for it.

As an example, Google Adwords started out very low priced, and companies who where fast enough to take advantage of this were able to make millions.

Nowadays, facebook still has very reasonable prices when compared to what Adwords is charging these days At the same time, within the platform, depending on the marketing campaign goal, using video views might be underpriced, while direct traffic to your website may not be the best option for your overall goals.