Who else can it be relative to?
I doubt that yoyos can value themselves, there has to be some sentient and rational individual calculating the wealth of an object in regards to another object. I guess I have to educate you on the adjective form of relative. Now who the heck do you think is doing the comparing of two objects… say two plastic yoyos. Oh, that right, it would be the observer. In your scenario when you compared the Rally and the Protostar you were the observer. Just like I would be when I do the exact same comparison. Our views are different because we OBSERVE different criteria that we base value on, such as any extra machining to smooth it out and the country of manufacturing.
Relative:
Adjective: considered in relation to something else; comparative: the relative merits of democracy and monarchy.
You say you aren’t trying to be argumentative but I dare say you are purposely being obtuse in order TO BE argumentative.