Collusion Hoax

How thorough is too thorough? Today we got yet another update on Robert Mueller's investigation about the alleged collusion between Donald Trump's presidential campaign and Russia. The investigation has been going on ever since rumors first appeared waaay back when Trump won the presidency and they haven't stopped once since then. Today's update on the investigation (as you can probably tell by my title) yielded no results or evidence of collusion yet again. I have no problem with being thorough on things, and Russian collusion on something like a presidential campaign would be a big deal and is definitely worthy of a thorough investigation, but shouldn't there be some point when you've got to call it quits for something like this? Three years of nonstop investigation and still zero evidence of collusion or cooperation. Maybe there's some bigger thing I'm missing but from all that I've heard and seen, continuing this investigation for much longer would prove to be nothing but waste of time, effort, and money. Maybe there's some big discovery that the Mueller gang is right on the cusp of, but so far all we've seen is a whole lot of nothing and millions of taxpayer dollars down the drain. Be as thorough as you want with an investigation, just maybe don't spend/waste a bunch of the people's money in the process.