The camera phone (Read the Rules!)

I settled on 75 entries for a couple of reasons. First, you have to be ready to enter the challenge, so if you read the challenge when it was announced, then your should be ready once it is open for submissions. Second reason, when it comes to voting, I think 75 is a reasonable number to view and vote upon. When I vote I always vote on all entries, if there are 150 or 200, it becomes a daunting task and since this is supposed to be fun, I skip the voting or only vote for a few that I like. Voting for each entry provides a fair (more or less) representation of how DPR members felt about the submitted work.
Therefore, I have settled on the 75 entry limit. I think it works for every one.
I might host the same challenge again, in case you missed it the first time.