I don’t think that I’ve ever had a Uke that didn’t need a set-up and each one of them has vastly benefited from one. As for spending $75 that’s almost a separate question and I’d very seriously have to consider the value of the Uke before spending that type of money on it. Fortunately for me I know how to, can and do set-up my own instruments, the effort involved isn’t small but it is worth it. Depending on what work is actually done and where you are $75 might be excessive ... your judgement and choice.
Instruments typically come out of the factory right enough to ‘play’ and right enough not to have buzzing strings - some play better than others and some shops will tell you that an instrument is just fine as it is - struggle through if you wish or see what can be done to make your life easier and your playing better. Anything else (work) after that basic factory build involves risk and spending more time, neither of those is attractive to manufacturers. If you want to get the best out of what instrument you have then a set-up that looks at the finer details is the way to go, whether it is economic or not is another question.
I got in the habit of setting up a uke with low action, but I am not sure why... In my younger years somebody said that they liked low action, so I followed that, I suppose.
But the last uke I setup had disappointing volume and a somewhat dull sound. I swapped out the saddle with one providing substantially higher action with grand results!
Perhaps here is a good thread to (have another) talk about benefits of low vs high action...