Dee,
You are so funny but I agree with you 100%. I like to use the same thread on the top and bottom. When you are making a quilt you use so much thread buying prewound bobbins would be cost prohibitive. Also, what do you do with the bobbins when they are empty? Add them to the landfill? Reuse? Then you are back to winding your own bobbins. It doesn't take that long to wind bobbins.
Marie