But of course! If, at a children party, you put on the table carrot sticks and chocolate, milk and coke, the coke and the chocolate will be gone as sure as the carrots and milk will be left.
I can't speak for other people who have proofed at DP, and I am not currently proofing at DP, but, in practice, this is how things used to go for me: "Gee I am tired and I have a headache but I still feel like I want to make a contribution to PG. Since I have low energy right now I'm not going to work on my own projects, why don't I go to DP and see what I can contribute for the next hour. Hm, they have a lot of really hard uninteresting texts with really bad OCRs which no one is ever going to read anyway. I don't think I feel like working on those right now, in part because their proofing tools are not very good and its going to make my headache worse. OK, now here's a novel that actually looks like something someone might actually read some day, and the OCR is competent -- not that great but not that bad, so I guess I can 'knock off' a bunch of P1 pages pretty quickly and pretty accurately and make at least *some* kind of contribution today. I'm not going to work on the higher rounds because I don't feel like I'm at the top of my form right now and I'm afraid I'll let a bunch of stupid mistakes go by...." Now, I'm still looking for the coke and the chocolate -- what volunteers *actually* get at PG *and* DP is typically a swift kick for their efforts.