Why do scientists consider any hypothesis valuable?

Answer 1

Any idea about how an unknown phenomenon occurs, or a simpler explanation for a known one, is useful in figuring out what exactly makes it happen. If it works, it can be tested and refined to provide a better explanation; if not, it OS one further things we know doesn't work.

Answer 2

A hypothesis is basically a rough draft, which then goes through a process to find any faults in the hypothesis. When faults are found, they are corrected and the process continues. I think your question is a bit misleading and you are possibly a bit misled.