If you or anyone else anyone would like to try making mayo, it's easy if you have a stick blender, and the end product is tastier. There's a good base recipe at
https://www.seriouseats.com/two-minute-mayonnaise I'll admit I make it less often than I use the commercial stuff though
We all know how most people shop, and so do manufacturers and stores. They buy what they want with only limited regard for the price, seldom if ever PM or use coupons, etc. The silver lining is that if significantly more people started shopping more frugally, it would affect the deals available to those of us who do.