Personally I find your argument disingenuous at best.
> We find sites [...] that are not looking to get paid [...].
So basically what you are saying is that you are looking for free real estate for hidden advertising.
You get paid by your clients while the sites' audiences are the real product.
> [...] are always 100% relevant to the site's audience [...]
I worked in publishing. I worked with many content farms as well in my time. If I had gotten a dime for every piece of content written by an "expert" (but in reality some poor student in most, a general editor in best cases) I would probably have a nice vacation awaiting me.
"information written by an expert" is a nice claim as long as no one:
- needs to define what an expert is
- doesn't need the expert to be an expert in the relevant field
Additionally Google (and others) value recency and pushes good content down because it is "old".
As long as there is a valid business being made with the SEOfication of the long tail by pseudo expert advertising disguised as content with the goal of making readers believe it was genuinely written without conversion goals in mind by a neutral party there is very little chance of this situation improving.