[Joeri]

Offering options anchors the range. Most people will choose the middle of the range, because choosing the low end makes you look foolish, and choosing the high end makes you look greedy. The choice they make has very little to do with the actual value they would accept, more with how they think they will be perceived. The correct way to do it is to just offer an input field, not a multiple choice, because then there is no anchoring.