There are a couple problems you face when you try to target very high paying keywords: Competition -- it is hard to place for these because everyone wants to. Blacklisting -- Google (and probably other search engines) won't index new domains with words like insurance, mortgage, payday loans, etc. because of so many spam sites targeting those.
Initially you won't get ads based on those keywords. When I first setup my computer repair website, it was putting shoe ads on my site. I was like WTF? Do I look like a friggin' shoe company? Absolutely zero mention of shoes, sneakers, or anything that would even remotely insinuate I wanted to sell shoes. I tried to filter them out and it still didn't work. However, months later I went back to my site, and every single ad was very relevant to the content on my site. So my opinion is that initially you will not receive the ads you seek, but as the domain ages, with the content, you will get the relevant ads you are looking for. My computer repair site is only 5 pages. All I did was create 5 pages of content. Granted the ads on my site are only paying around $1-$2, but that is probably due to the fact I haven't done any seo or marketing for the site. The more content you create the more relevant the ads will be, and the better paying the ads will be.
This is my first posting. I have been reading up a little on high paying keywords and have found out that sometimes, what seems to be the highest paid (or bid) keyword may be only paying a fraction (or less) of the amount. Thoughts?
Quick research on the following high paying keywords Digital Photographer - $1.88 (highest) to $0.23 (lowest) Digital Photos - $1.01 to $0.05 Sell Online Photos - $0.00
Another quick research on the top ten bids for the following keywords Crimminal attorney is $0.00 (wrong spelling) criminal attorney - $17.93 down to $1.16 real estate - $0.95 down to $0.05 does this helps?