There is a thread on WMW about the right price to sell an article for. The general consensus is that the author should probably wait it out until their site ranks and just keep their content.
While that is nice in theory, there is no guarantee that a site will eventually rank well just because it has decent content. Of course I am taking stuff out of context here, but you can read the thread to get the gist.
As one site is willing to pay you, it doesn't make sense to give your articles away to the other site just to get a link.
A friend of mine recently published an article on A List Apart. I think it would be hard to sell most any article for the value he is getting out of the authority of the link from that site, let alone the boost in credibility.
plus good primary links to your site may lead not only to direct exposure and link popularity, but also secondary exposure and more link love.
since your site is new you likely have lots of content and not so many links.
Whatever you decide, don't make the mistake of granting anyone exclusive rights to publish your work in perpetuity for peanuts.
for books I totally agree, but if you are obscure / new and / or are operating in a not so well known field and are good at writing articles sometimes giving them away is a great form of marketing.
Regarding your site, you will never leave the sandbox unless you keep your content 100% to yourself.
I think sitting chill with minimal link popularity is far worse than trading some of what you got a lot of for something you don't got a lot of (ie: content for links)
The web has taught me alot about not considering what things could or should be worth and that unless you actively work to make them worth it then inferior products which are marketed more aggressively will often win big.
if you have around a hundred articles I don't think it hurts you to share a few of them.
Some of the links you get by giving stuff away are links you never could have bought. Those are the ones that are usually worth a bunch too.
Friends don't let friends go unlinked. ;)
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