Brian from Instapaper here. We will not be serving advertisements in your Instapaper queue. The value Instapaper provides to Pinterest in terms of parser capabilities and aggregate information about links is enough to justify the small operation cost of running the service.
I'm happy to answer any other questions you have.
Brian
I paid for Instapaper so that it could run in the interest of its users. If it's fully supported by Pinterest, then its value to users is secondary to the value of its data and technology to Pinterest.
Why can't I keep giving you money? I don't want any special features, just your undying loyalty.
How much did you grow since now, last acquisition and first acquisition?