<i>We’ve accomplished this without spending a single dime on advertising.</i><p>Interesting, taptaptap, interesting. Let's see here:<p>1) Multi-thousand dollar, multi-day giveaways and promotions that require you to follow and retweet.<p><a href="http://taptaptap.com/blog/win-the-ultimate-10000-canon-5d-" rel="nofollow">http://taptaptap.com/blog/win-the-ultimate-10000-canon-5d-</a>
mark-ii-camera-rig/<p><a href="http://taptaptap.com/blog/laser-engraved-ipads/" rel="nofollow">http://taptaptap.com/blog/laser-engraved-ipads/</a><p>2) Lisa Bettany making seven appearances on This Week in Tech, and in surely all of which plugging Camera+, a channel not everybody has.<p><a href="http://en.wikipedia.org/wiki/List_of_This_WEEK_in_TECH_panelists" rel="nofollow">http://en.wikipedia.org/wiki/List_of_This_WEEK_in_TECH_panel...</a><p>3) Getting pulled from the App Store and subsequent free publicity, again, fairly risky and unreliable for getting covered.<p>That's some road to take not to require advertising to get the word out about your app. It's technically TRUE that you didn't buy ads, per se, but it's not like this success, especially in relation to point 1, was free, as your opening seems to imply. Put another way, your marketing expenditures aren't zero.