You already have a $200 2500K, it sounds EXTREMELY pointless to pay $330 for a 2600K when it gives you very little increase in performance. I think you're getting a little too hung up in the "ppd" and its clouding your judgement. Remember, like Ifalna said, you're voluntarily contributing to science, that should give you enough warm fuzzy feeling, what does points matter? (there will always be someone with more points than you)
As far as the "throttling" you speak of, that max multiplier is not made to be run for extended periods of time. It's controlled like an internal timer, once the buzzer goes off, the chip returns to the "stock" frequency. Once it's sat at stock frequency for a while and cooled back down, the turbo boost will kick back in. If you disable "C-States" and/or "Speed Step" in your motherboard BIOS, it should allow the processor to constantly run at max turbo boost multiplier for an unlimited period of time. This is what is done in most articles benchmarking the overclocking performance of K-series CPU's so that they can get a long enough sample time. I wouldn't do any of this if you're going to be leaving your processor folding for long periods of time. However, if you do, be aware that you may have to increase the CPU voltage a bit to achieve stability. Also, don't be suprised if your CPU lives a short life.
Main: i5-3570K, ASRock Z77 Pro4-M, Asus GTX660 TOP, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Hand-Built Wood Case