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Also when you buy for page rank, google seems to do some sort of grouping, the more the websites are interrelated the, the better it is.
Did others find that to be true?
The problem is how is a group defined, I think it is essentially a graphing problem and clusters in those graphs would indicate hi page ranked websites.
For keywords like "web hosting" or other high paying keywords google recently instituted a filter that checked to see how often one particular keyword is used to link to a website to identify 'artifical' sites. I.e. if 90% of your backward links all link using the SAME high paying keyword, your site gets filtered. I think around 50% is safe but you never know with these algo's, it may change based on number of backlinks (for 100 links its 50%, for 1,000 its 35%?)
Just my 2 cents.
But I am curious about others who may have successfully implemented this strategy, buying websites to boost a page rank. Did the one concentrate on similar subject matter (already interlinked websites within a certain subject matter?)
Really bad idea, and never more so than now.
Buy strategically, from PR1 to PR 7 or 8.
Buy as a part of a larger plan.
Think related, theming, authority, and kw's.
Many of my competitors penalised because of buying links.
Most of my competitors wouldn't exist without buying links.
Caveman has it right, buy carefully. Treat it like any advertising plan and buy on related sites where your users would be, and don't put your brand next to other advertisers you wouldn't want to be associated with.
buying PR on a massive scale
I know it seems like a good idea, but let's face it - white text on white background seemed like a good idea to a lot of people not so long ago! ;)
Any technique done on a massive scale is likely to either:
a) Cause Google to simply implement a broad filter to prevent the technique skewing results, which will probably have a knock on effect to a lot of people (deservedly or not - Sandbox anyone?).
b) Cause your site to be flagged due to an anomalous increase in backlinks over a short period of time.
Now someone referred to buying PR as advertising, but I'm sorry it's not - advertising very rarely turns round and bites you on the ass.
You generally know where you are with advertising campaigns and although monitoring results may not be quite so tangible as with SEO activities, there are less uncertainties.
The worst that can happen with an ad campaign is that you overstep the boundaries of good taste and offend some people - some bad PR, you lost a bit of money but you can recover.
With SEO related stuff, the worst that can happen is more serious (for most) because you can generally lose more and find it harder to recover.
Paying someone else effectively for a service that they don't provide and have no control over is risky. Period. Speak to some ex Top Pile clients.