Advantage(s) to using surveys as opposed to experiments is (are) that
(a) surveys are generally cheaper to conduct(b) its generally easier to conclude cause and effect from surveys
(c) surveys are generally not subject to bias(d) surveys involve use of randomization(e) surveys can make use of stratifications

(A) Surveys are generally cheaper to conduct.

Explanation:

Both surveys and experiments are valid means to scientifically establish data about groups of people and how the way specific variables influence them. A survey examines the way a variable we have no control over has affected, for example, a group of people. In an experiment, one of the variables is manipulated while the other one is measured.

Surveys are comparatively inexpensive, especially if they are online surveys, and even if incentives are provided to participants.