Your wife and kids love your cooking because they're used to the blandness and lack of balance. It's no different than a person that's raised on a processed food diet thinking that properly salted food is bland.
The PROPER use of salt certainly has an effect on both the taste and the sensory feeling of food. Of course adding too much salt just makes things salty, the challenge is learning how to season food properly.
I'll also call out your B.S. "I couldn't afford that $1.00 expense" excuse. Salt is the cheapest seasoning in the supermarket.
I suggest you start here:
https://www.ncbi.nlm.nih.gov/b...
Where you can read fun facts like the following:
Salt imparts more than just a salt taste to overall food flavor. In work with a variety of foods (soups, rice, eggs, and potato chips), salt was found to improve the perception of product thickness, enhance sweetness, mask metallic or chemical off-notes, and round out overall flavor while improving flavor intensity (Gillette, 1985). These effects are illustrated in Figure 3-2, using soup as an example. In the figure, the distance of each of the points (e.g., âoethickness,â âoesaltinessâ) from the center point represents the intensity of that particular attribute. This figure shows that when salt is added to a soup, not only does it increase the saltiness of that soup (compare closed circles with open triangles and open circles for saltiness), but it also increases other positive attributes, such as thickness, fullness, and overall balance.