Yeah you need to "tempt" people to donate. Put up as much as you possibly can. People need to believe in you as much as your project. End of the day, if you don't give too much, then in their eyes (imo) you're not that bothered. I'm just offering advice based on what I've learned by looking at many many donation based games.
One thing I have noticed is that people are now becoming wary of projects that could possibly be abandoned. You need to show them otherwise ;)