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The Pope can have one of mine if I can have one on his.

As above really.  Build links by offering your products to bloggers for product reviews, this is dependent on value of your products, relevant blogs will also drive traffic and sales too.

You also want to make sure you can get most/all of your products in GoogleBase (shopping feed) to maximise your organic visibility, check our Google's Merchant Center.

Okay so we all know that:

1 Link on 10 Sites > 10 Links on 1 Site (potentially untrue with spammy links on 1 site than 10 links on high authority but that's not the point of this discussion)

I've had some discussions at work I seem to be fighting a losing battle...

So the questions is... which is better?

1 Link on 1 Site vs 5 Links on 1 Site (same site)

We seem to operate on the form of - once we have a link from the site (in most cases blogs for product reviews / guest posts) - that's it , we move on and never talk to them again.

For continued growth of links, would it be beneficial if we guest posted on some sites once a month?  Then we get a steady stream of links each month.