I created a contest, but (almost) nobody is interested. What I'm doing wrong?
Yeah as it's been said it's all effort vs the prize.
The more effort the better the prize needs to be to get more traction.
For instance CMD, 2nd to last poster after she was done eating her turkey sandwhich won a game too easy... so people would post thinking ok,... 30 min or so she should be done with her sandwhich :) Then they found out that it was a two part sandwhich :) Extra innings went into to play and the red sox won the world series (true story). People had fun with it and started talking about sandwhiches, pies, and various other things. At the same point everyone was still doing the contest as well as it didnt have a real goal other then being the 2nd to last poster.
The music part of your thing was a pain I listened to one and was like damn..... gonna drive me nuts~! so I stoped for the rest of them....
Mine, I... sometimes do code things, sometimes just random things, adlibs, etc. The other thing with mine was, I saw how many other contests were out so i asked the other contest holder type people if it was cool with them if I did a couple, (I was going to post one last night but decided not to because there are so many going on right now the market is saturated).
for 5 bucks... I'd do the contest if I could make a fairly easy attempt and have a chance.
for 10 bucks, I'm willing to be a bit silly and do adlibs, or story, or just post, type of thing.
for 100 I'd put a lot more effort into the thing.
for 1000 I'd skip work for a day :)
for 10,000 I'd tell my boss, and or coworkers about it and get ideas and what not to try and win :)