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I posted this message on the UK forum but then realised this one is probably more appropriate.
Kind thanks for any advice
The only advice I'm prepared to give away is that in order to do well and find the niche keywords you need to treat the research a bit like an onion. Peel away at the layers.
The fact that they don't offer an Amazon type suggestion tool means that there is still inventory around that will deliver great results, but at a fraction of the cost of the normal keywords in an industry.
Most advertisers follow what I call the "sheep mentality", they use the simple basic tools, come up with a list of 20 or so keywords and bid on those. But it's the keywords that languish below that top 20 that often hit the mark. Most advertisers never get that far, hence the value that exists.
What works with one PPC may not work on another, which is why you need to do a lot of cross-referencing and testing.
The tools that the providers give you are OK to a point but because it's historical data there will always be that X factor involved, particularly for time sensitive events.
One of my biggest criticisms of adverisers is that they don't get in quickly enough, but expect to steal a march. There is a huge benefit in being an early adopter or first to market. You get the benefit of the cheap traffic to start with and can move on to other inventory as it becomes more competitive on the heavy volume keywords. Never take your eye off ROI.
The only other tip I'll give is to think laterally and jumble up all the single word or syllables, to give you the permutations of keywords. More often than not you are only one or two letters away from a pot of gold, you just don't realise it.