Data sharing is an important part of the scientific method. Without data sharing, the wheels of science would grind to a halt (or at least slow to an unbearable pace).
Science is not done in a vacuum…well, sometimes, but you know what I mean. Scientists, to a marked degree, build upon the works of others that have gone before them. Without access to a published scientist’s data, science wouldn’t be science. It would be riddled with heresay, lacking any way of true verification.
As an example, without data sharing, I would not have been able to create this time-lapse of Hurricane Ignacio approaching (and sliding by) the Hawaiian Islands.