In Season 3's "Forever in a Day", Daniel and Teal'c discuss what happens when two Goa'uld have a child:
Daniel: Teal'c, what happens if two Goa'uld hosts have a child.
Teal'c: It is strictly forbidden, punishable by death.
Daniel: Really. Why?
Teal'c: If two hosts were to mate and produce a child, that child would contain all the knowledge of the Goa'uld.
Daniel: So the genetic memory that Goa'uld have in their DNA is passed onto the human offspring.
Teal'c: That is correct. Such children are called Harcesis. These children are hunted down and destroyed by the Goa'uld with great impunity.
Daniel: So the offspring, the Harcesis, would contain all the knowledge, all the secrets of the Goa'uld that…
Teal'c: Yes, Daniel.
Another question on this site asked if a Tok'ra could mate with a Goa'uld and produce a Harcesis child in order to gain intelligence. But why would the Tok'ra not want to create a Harcesis child between two Tok'ra?
It seems clear to me that the reason the Goa'uld don't want a human child having the knowledge of the Goa'uld is that they crave power. A human who knows where all of your military bases are, your weaknesses, and so on is likely to use that knowledge to help overthrow you, especially if that craving for power is passed on as well.
However, the Tok'ra don't have that craving for power due to the Goa'uld Queen Egeria giving a mental imprint of compassion and a desire to rebel against the Goa'uld. Especially with their diminishing numbers (a plot point brought up throughout the show), it seems to me that duplicating the knowledge of the Tok'ra would be a good thing. That way, if a Tok'ra dies, there are humans raised by the Tok'ra who still have that knowledge.
So why didn't the Tok'ra ever create a Harcesis child among themselves in order to preserve their memories?