This article is not 100% clear on whether it means "true" investment or just paying for a service, which is not the same thing at all.
But regarding "true" investment, It's something we looked at 18 months ago when raising our Series A. At the time it was impossible due to SEC regs around accredited investors and max number of investors (deeper analysis here: http://www.startupcompanylawyer.com/2012/05/26/is-crowdfundi...) so we gave up. But it would be great to have simple ways of getting it done.