From my experience, after GPUs came affordable to be used in SETi@home...have rejoined there with only GPUs in Mar 2014! & been experimenting with some other projects like GPUgrid, Einstein@home, Asteroids@home & SETi@home BETA...

Result on today:
5x GPUs got 4,48M BOINC points from Mar 2014!
10-20x CPUs (cores, but that only lately) got 10,3M BOINC points from Nov 2006!

So, those are the facts...why GPUs are not being so advertised by WCG staff on beginning of the project...it's unknown to me!
'cause if it was more advertised, maybe we might have some project on GPUs also...or only GPU?!
;)

Correct. Some algorithms simply can not be adapted to GPUs, regardless of the effort. Some recipes can be sped up by adding lots more cooks, but most can't.

One of the WCG missives is to have projects accessible to as wide an audience as possible... so somethings that requires Tesla power simply is out of the question, too niche. One day, the tilt point will be reached where though "oh running in-house is cheaper/quicker/total homogeneity", and several have done that... pulled off the DC grid. After all, it's the results that count and science progress and today 2 years for a project is becoming too long with about 7.3 billion people needing to be fed, and kept free of disease, or we will have pandemics/epidemics in no time, as Zika is swiftly developing into with an ever more warming world.

And this is, i think, the purpose of gpu: accelerate the research, reduce the time. Don't you remember the speed of HCC project with the "coming" of gpus??

Obviously, if this is possible.

I'm not trying to start a debate between WCG and F@H, but yes they've published several interesting peer reviewed articles, a full list is on their page. https://folding.stanford.edu/home/papers/

I'm curious, what are results from WCG? I can't find a list on the website of published papers or results, just completed projects. I've dedicated a lot of CPU time to WCG so I'm wondering myself, not trying to start an argument.

I've recently started with F@H because my GPU is not being used at all by WCG. I can't run GPUGRID because they don't support Pascal GPUs (I have GTX 1060), but F@H supports my card just fine. I've never folded with a GPU before, but wow... GPUs are much more powerful than CPUs at folding. My GTX 1060 gets 350k ppd while my overclocked i5 3570k gets about 20k. I really don't understand why WCG doesn't take advantage of GPUs more given how much more powerful they are. It's such a waste to not use the GPU, and I'd much rather use my GPU towards WCG because F@H has like 100x the computing power of WCG and clearly needs the help (no doubt this is partly due to GPU support...)