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Why should I trust investment banks' ratings?
If there's indeed no reason to trust GS, i.e. those are just guides   then the question is: Why do investors seem to care? Because there's a reason to trust. You're just reading the bottom line - the target price range. More involved investors read the whole report, including the description of the current situation, the premises for the analysis, the expectations on the firm's performance and what these expectations are based on, the analysis of how the various scenarios might affect the valuation, and the evaluation of chances of these scenarios to occur. You don't have to trust everything and expect it to be 100% correct, analysts are not prophets. But you do have an option of reading their reports and critically analyzing their conclusions. What you suspect GS of doing ("I tend to believe those guys just want themselves a cheap buy price a few days before Q2 earnings release") is a criminal offence.