many scientists who are sent papers to check, do not repeat the experiments or even read them.
How do you know this?
You do realize that when someone is asked to review a paper for a reputable scientific journal, theyhave to provide a detailed analysis of it along with reccommendations for improvements, fatal flaws, etc., don't you?
Not reading the paper makes that step rather impossible.
Also, scientists reviewing papers for publication are not supposed to do replications. Replication happens by other labs who read the papers after publication.