i think that the topics of what the contests are on are going to affect how many people participate.... voting isn't going to have much of an effect... a good photo is going to win regardless of the voting... even if you remove voting all together, the best photo is still going to rule the thread with tons of comments...
for example if you did a secenery contests, theres only soo many people who have well modeled stuff and only a hand full of them do it extremely well.. leaving those people to win with a chance for anyone else... you have to think up something that will be really broad that anyone can participate in without needing large sums of money or modeling hours... our contests are a bit more of a "scenery and modeling contest" than they are photography contests
maybe some contests on photography creativity, as in photo angles and lighting effects or something... something thats more photography?? i know even if i hired a professional photographer, i still wouldn't have had a change of winning half the contests i've been around and seen here soo far just for the fact that i use plasticville, a flat green platform with no landscaping, and that ugly 3 rail lionel track as opposed to anything else.... but thats what i want to model, soo i cant just go out and get photos of well modeled and landscaped stuff