Get the same things everywhere you try to sell things, I have some leisure batteries on Trade-it and even though I have priced them at rock bottom prices ( £10 lower than the next cheapest) Im still getting emails offering less.
Ive noticed one rule of thumb, no matter what price you put something up at, I guarantee someone will ask if you can do it for a fiver less. £5.00 must be a magical figure or something.......
What sort of silly questions are you getting BTW? post em up, we all love a good laugh