Out of curiosity, at which Alexa rank range do you take new sites serious? 100,000? 50,000?
From a little bit of research it looks like piccys.com has 30 million page views with an Alexa rank of 8518, and weheartit.com has 850 million page views with a rank of 1367. So the top 10,000 seem difficult to get into as a newcomer.
Anything inside a million at least suggests that there are real users visiting the site.
The sites in the millions basically do not have any traffic. Newly registered sites get into that range from a few random search engine hits even before they have any real content.
From a little bit of research it looks like piccys.com has 30 million page views with an Alexa rank of 8518, and weheartit.com has 850 million page views with a rank of 1367. So the top 10,000 seem difficult to get into as a newcomer.