You're talking about paying over 50 cents for a single use measuring cup, vs a standard plastic cup which costs between 1 and 2 cents. Whatever works for you!
I'm just saying, if you are going to take the time to pour water at each measurement amount and pour that into a plastic cup and draw lines with a sharpie, is that really worth the effort of not having to clean your measuring cup?
And the product I posted was just all that already done, I wasn't suggesting using that for all your measurements.