The most compelling is that AngelList bought PH for the data they have which they can turn into profit.
Product Hunt’s Sale Demonstrates What’s Wrong With Startup Culture

I would be interested in seeing some numbers on this. In my experience, the cost per acquisition for a new user is around $3.00, using inbound marketing. How many users did AngelList get for $20 million? Can they convert 1 user into 2 users through referral campaigns, etc. I’d love to see how the ROI is projected and measured in these acquisition deals.

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