Cargo, the film that Rachel Perrie supported

Last week a woman named Rachel Perrie became the millionth person to pledge financial support to a project posted on Kickstarter. It's a remarkable feat, given that company hardly two years old, and it comes on the back of another milestone — $100 million has been pledged on the Kickstarter platform.

Kickstarter co-founder Yancey Strickland and Fred Benenson penned a blog post earlier today to commemorate the dual accomplishment. Far from the self-congratulatory back patting you might expect, the post provides an interesting portrait of the state of crowdfunding: who's contributing; how much money they give; do they come back?

The latter question intrigued me. Only 16 percent of Kickstarter backers come back to pledge a second (or third) time. That number is on the rise, but slowly, and I wonder what will happen to the company's hockey-stick growth rates as they begin to saturate the market (and as hungry competitors like IndieGoGo gain marketshare). Another factoid of note: If they keep steaming ahead, it won't be long before Kickstarter provides more arts funding than the National Endowment for the Arts, whose 2011 budget is only $154 million.