I link to other profiles when such exist. Otherwise I may link to a Wikipedia page (if the other person / people was / were notable in some way).
I have over-researched census returns, to find maiden surnames for the wives of relatives, or schoolmasters, on the off-chance that one day those folk will have profiles.
I have linked to relatives who were not in the immediate family, so are not attached to the profile, and to ministers (baptisms, and marriages) when I remember to see if they have profiles.
I find it interesting to know who else was involved in a life, other than immediate family members.
I will say this has inspired me to go look for a few ministers who officiated marriages, or baptisms just to add those links in. I will try to remember to do the same for funerals, too, in the future, when such are named in records.