A lot of the time we fall into the trap of thinking that, once a profile is 'up there', it is finished. If there is only one source (ie a census), we think "well, that's pretty rubbish". But profiles are a work in progress.
For instance, if I find a census with twelve children, I will create all the profiles: father, mother, 12 children with that source. Then I can sit back and view the relationships a bit better, what I'm going to be looking for, plan out a research strategy and a research log, and so on. And then I roll up my sleeves and start researching. Somebody else could come along before I had finished (in fact, while I am in the middle of researching) and say "well, those are some rubbish profiles. She just wanted to get lots of contribution points." That's why you will see 'home-made' signs like "Under Construction" or "Just Adopted - gimme a break!". We often seem to think that a person will do all their research offline BEFORE they put it on WikiTree, when in fact when you put a profile on the Tree, you stand a better chance of online researching.
Yes, I know there are exceptions. Dump-and-run GEDcoms from 2011, for example. But the majority of profiles are *being worked on*, either on WikiTree or offline. That's what makes this hobby great - there's something to do all the time, and some people work better (and faster) from an online profile.