If something is open source you can't complain if someone sells it. Obviously if the software is open source, everyone who buys a copy is allowed to sell the software themselves and they don't have to give the original author any money. They also cannot stop someone taking an older version of the code and distributing it.

What? I really don't get why so many people don't understand that "Open Source" does not mean you can't sell it, nor does it mean you can sell it at will or whatever. It just means you can view the source. The term "Open Source" does not make any claims about monetization, it does not even say which kind of license is at play.

You can publish your code open source, charge for it and still forbid people to sell it or even redistribute the source.

"Open Source" is not a license. GPL, BSD, MIT, Apache etc. are all open source licenses with very different rules. Here's a list of licenses many people consider "open source licenses": http://www.opensource.org/licenses/alphabetical

Conversely, you can have closed source applications which allow you to redistribute them or even sell at will. Closed source software is just more likely to have a license which is very strict about redistribution, that's all.