Not a publisher, just a customer
I've said before in other threads that I'm not a publisher, just a customer... a big customer perhaps but just a customer.
As such, IMHO it's not the responsibility of RPGNow to police the D20/OGL compliance of the products they sell. In all honesty, it's not their responsibility to police even the quality of the products they sell. They provide a very useful comments functionality for people to post and read reviews for that very purpose. I've posted reviews there and I read them before I buy a product (unless I've become very familiar with the publisher and feel confident in the quality of their product such as Malhavoc, Natural 20, Phillip Reed, WorldWorksGames, and so on).
It's also not the responsibility of the community to police D20/OGL compliance of products created by other companies in the field. As a business, it is their responsibility to create product that complies with appropriate licences and distribute it to the available marketplace.
And lastly, it's not the responsibility of the consumer to police the D20/OGL compliance of products they buy. Of all three groups mentioned, they're the ones with the least ability to do so (lack of legal knowledge and lack of familiarity with the terms of the licenses in question). Not to mention that at that point in the chain, the consumer has already purchased the product and is more interested in getting value from it rather than checking for license compliance.
The only parties with responsibility involved are WOTC and the publishers using the D20/OGL licenses and 90% of the burden is on the publishers putting out the product. WOTC's only responsibility is to police the marketplace so they can send those fun "cease and desist" letters so they can protect their intellectual property.
Now it can be argued that past responsibility, there's parties who have an interest because it's in their own best interest that all publishers put out quality and compliant products. RPGNow obviously has an interest because they are the premier sales point for PDF based product. Other online vendors and the FLGS have an interest as they sell print products which also need to be of good quality and compliant. Other publishers want to see good quality and compliant product from their competitors (although maybe not as good as theirs
) because it generates interest in the market and assists in market growth. And of course consumers want good quality and compliant product so they can enjoy what they buy and get more in the future. But the bottom line is... there's no responsibility here, just common interest.
Now I try not to write something like this (and especially one this long) without providing a solution and this one is simple. Use the reviews sections on RPGNow and EN World. Post reviews of products you've purchased. Read reviews before you buy. Publishers that continue to provide good product will get their reputation for it. Publishers that don't will find themselves out of business and the market will be better for it. But if you're absolutely certain that you personally have an interest in keeping the quality of the products made by other companies up... write reviews and see how the consumers react to seeing consistently bad reviews for a product or company.