Should glossary links be used as much as possible?
Actually, I question the value of hyperlinks at all. You are assuming that the reader will be using a specific technology to read, rather than just a printout. 

It is really enough, in my opinion, to refer to the glossary at the first use of a term and forgo it thereafter. If the reader is aware that there is a glossary, they can go there in any case if they are puzzled. 

The links will interrupt the flow of reading in any case. There is value in making the work beautiful, not just informative.