Is it wrong to display meta keywords Dynamically into your source. Can it decrease the SERPs. heres an example, chk the source code for this link. http://www.connectmobiles.com/tech_spec.asp?id=12
The meta keywords tag is not so important these days. Generating them dynamically is no problem though.
If you didn't dynamically insert keywords, description and title of the page then all those tech spec pages would almost certainly go supplimental as the mentioned tag data would be identical.