No, most hardcore opensource/freedom respecting software advocates argue that the only kind of unethical software is the software that's proprietary--meaning software that isn't open source.
They wouldn't argue that selling open source software is against the spirit of the open source movement, because they don't respect the validity of selling software under restrictive proprietary licenses in the first place thereby meaning that the only valid way you could sell software is by selling open source software.
By selling open source software, you are doing nothing to restrict the freedom of the users and you aren't hurting them in anyway. You are providing a potentially useful commodity for them--a single media in which all of the open source software they need is installed. So they don't have to fish for the material themselves online. If they wanted to get the software themselves, they could go out of their way to download and install it themselves.
Here are two links regarding the positions of the open source movement and free (as in freedom) software movement on selling open source software.