**Editor’s note:**Ross Rubinis principal analyst at Reticle Research and blogs atTechspressive.*Crowdfunding campaigns employ all kinds of logical and emotional appeals to get you to dig into your wallet. But in just the past few months, there’s been a rush of different products seeking to replace yours. Why Kickstarter – which screens all projects – saw fit to greenlight 10 variations on a theme in so short a time is something only its curators can say.