Jersey,
LOL!!!
I really feel bad for your customers.
The best way to run a business is to treat your customers fairly and honestly. If you continue to cheat your customers, your negative reputation will precede you.
You will be tough pressed to find a Game that is highly constrained by a C2D or Q2D running at 2.4Ghz. Most likely it's going to be the GPU or perhaps memory. (Yes, the 3rd GB can be quite important for some games. This leaves a full 2gb for the Game and 1gb free for the OS.)
Secondly, People on this board make "complete" recommendations.
That includes not running the Conroe at Stock and only buying retail boards that properly support the OC.
It's like selling somebody a Sports Car with a Stick Shift and complaining that it cant hit high speeds in 1st gear.
The Reason why the Quads are recommended is because they can OC to nearly the same Speed as the C2D chips. (3.4 vs 3.6 or maybe 3.6 vs 3.8) Less than 10% performance difference which is generally not highly noticable. However, when something is quad supported the quad chip will win by 50% or more.
The issue in this thread is that the Phenom is clocking about 40% slower than the X2 not 5-10%. Additionally, these chips are already much slower than the Intel chips so the extra power is needed.
When you see the threads for folks suggesting the Quad, it is usually the last and final upgrade after all of the other components. No, people are not recommending the Q6600 as better value for performance than the E2160. But for those who have the cash and want to spend the money, go for it.