No,it is not true because musing gives upvotes on seeing the content and how it is written in proper words similar to question then only musing gives upvote. Musing can upvote maximum answer If the answer is in proper content . There is no any particular limit for musing to give upvote to this much people only and leave after given minimum upvote it is not true but musing as a reason on how to give upvotes and on which content they prefer to upvote and how much percent have to upvote this all things are depend upon the qualify of answer.

When we are asking question then also musing gives upvotes the reason behind it musing gives upvotes on question which is related to topic or it is important one.