I hear ya. Supreme Shine towels are good rags. I have 24. This goes back to my experience with the crimson and its siblings; basic rag yet 'Swiss Army' useful. Not great at everything, but good...
Understandable. It can feel a bit on the thin side vs others. Personally I've found them pleasant to use, although it does require some degree of finesse being lighter gsm. Gone through all sorts...
If you are unsure, you could always use them for glass and interior duties, and pick up the 70/30 or any of its 75/25 siblings I mentioned. Valentine Day sale isn't far off.
The Kirklands starting to get up there in price. I remember the 36 bundle selling for $17.99 (lowest I paid was $14.99). Now they're mid-high $20's depending on location.