I have established my startup in mobile app development for Android & iOS and found the Ads not useful because of very small fill rates and/or CPM (e.g. admob). If I have ad inventory of 100 million Ad request per month, what is the best business model for my case?
amazing question. Relevant to me right as I look for a developer myself.
There are not a lot of people looking for app developers, so ads would have been the last thing I would have suggested.
An easily scalable business model is to hire local sales contractors to find and funnel leads themselves in exchange of sales commission. They become 1099 and you only pay if they sale. You can create a site or squeeze page that reflects their local market but besides that your marketing costs will drop significantly while sales should increase that much more, as I often find their results directly proportional.
Best of luck!