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In that case I agree with Kane; the short answer is it probably doesn't 'hurt' anything, but it's most likely not helping anything either. Those domains are an investment in a way, in terms of hosting, bandwidth, code maintenance, etc. And currently that investment isn't really being used to its full potential. I don't know if it's still the case, but WayFair (née CSN Stores) used to have at least 20-30 domains 301'd to all of their major properties, usually mispellings, (name)sucks, that kind of thing.

If I take your meaning correctly they have something like 'site.com' as their main page, but also have 'site1.com' which is just 'site.com' content in an iframe on 'site1.com'? It depends on what they're trying to accomplish I guess, but from a link juice/seo perspective that seems kind of backwards. Usually people just 301 the domains over.

To add to Andrea's response, depending on what you want to do, it might not even be a Magento issue. You can do URL rewriting with the webserver itself for example. What I'm wondering is, are both of the pages indexed in the example above? If so then you've probably got duplicate content going on. One way to get around it would be to canonicalize one of the links and then 301 the other to the canonical.

Have them write educational articles about the products/categories. For example if you were selling android tablets maybe a write up on what the difference between OS 2.2, 3.0, 4.0 etc. Ever since farmer/panda I've been seeing content heavy pages with low link ratios shoot up the rankings. I've even seen it first hand in some pretty tight categories where we'll publish an informational page and then the day it gets indexed it becomes the number one result. Obviously you'd need an internal link structure that can pass juice to/from these pages as well (e.g. linked to the product/category its describing).

I think you're getting into what Google can know or not know territory; especially if you're dealing with different SKUs. If you're both working the same keyword though, and his CTR is higher that probably will have an effect. The original scenario of 'not much traffic' is different from this though, since you're implying that there is traffic, but it's being split into multiple types. If you're going with 'solid gold widget' and he's got 'plastic widget' and the latter is getting more traffic/clicks, then it may have an effect on the base 'widget' term relevance.

Are you saying the default page isn't in the site:name.com results >at all<, or just that it's not the first result? If the latter, it may be possible that there's a canonical/no-index situation going that is pushing all the internal link structure juice onto another page. I believe Google will order site: results by relevance/strength by default, and this implies either that A)the strength of the home page is weak or B)the link structure/canonical layout is passing all the home page's link juice elsewhere. This is entirely guesswork mind you, but is my first impression.

I Agree with Alan. We have a client with relatively slow moving product and they are top 10/top 5 for the majority of their keywords. However something to consider is the competition's space as well; are they moving 10 a day while you're moving 1 a month? If so you might want to examine what they are doing versus what you are doing. The advantage of 'slow' categories is that the competition usually isn't that strong, and there are usually incumbent players who aren't being aggressive with SEO. It might be that if you just do everything 'right' within that category you could get a bit of a bump over others who are relying on being incumbents.

I think this is a pretty deep topic to represent as an infographic; you may have to sacrifice some of the complexity of the material in order to make it 'digestible' in the infographic format. I realize this might be painful, but I think you have to consider the audience that is searching for NLP and what they want to know about it instead of presenting your (very complete!) definition of it.

To do that I'd suggest re-scoping what you are going to communicate here; for example still call it 'What is NLP' but scope it back to 'What can NLP do for me?' or 'Applications of NLP', that kind of thing. Your definition is very abstract, moving towards the concrete may help.