*shrug* I had some ebay gift cards that were burning a hole in my pocket so after rebates I'm paying about $450 out of pocket for a Xeon x5650. Depending on overclock I could hit 50KPPD as well and I have the option of doubling that when I find another good CPU deal. I think it will be a while before we see dual SB folding so I'm not so sure I agree with your assessment.
To further put this into perspective let's just talk raw numbers. I know that architecture improvements may help folding but until we see that play out we can really only compare raw cycles: Stock 2600K is 4core * 3.4GHz. Assuming you get it to 5GHz (a nearly 50% OC) you will have 20GHz of processing power. A 6 core chip only needs to hit 3.33GHz to have the same number of raw cycles (a mere 25% OC for the x5650 which is stock 2.66).
But I hope that everyone thinks like you that SB is the best thing since sliced bread because I'd love to pick up a mate for my CPU on the cheap