You moved to folding at home because you chose to move to folding at home.
Why did many of us switch, and encourage others?
Because we got sick of problems in distributed folding, and felt that folding at home was more worthwhile.
As for the GHz of activity number, it's VERY rough. At least for me, it's over 2X what I really have on f@h, but less then what I have on DF. It's a rough normalization to a G4 350. Right now it's a placeholder for a new feature that is planned for the stats code.