[EverythingEverywhere]

To get traffic, you must spend a lot of time dropping cards. In reward, you will get the same people over and over who visit your site, not to read your content, but just to drop cards. If you stop dropping cards, they will stop visiting. If Entrecard goes down, your traffic will disappear.

The problem with Entrecard is that it is an enormous time sink for the payoff. In the long run, you'd be better of trying to grow your traffic organically with people who actually care about what you have to say, than to go back day after day to get high bounce rate traffic that will disappear when you go on vacation.