Why paying a plumber to just look at the problem is often worth the fee

https://cleaneverycorner.com/slow-draining-showers-diagnose-main-line-vs-individual-drain-problems-and-finally-silence-the-gurgles/

1) Why a paid "look" can save you more than the cost of the visit At first glance the idea of paying someone to come by and "just look" feels like overpaying for curiosity. I get it - I've stood on both sides of that penny-pinching fence