What are incentives for scientists to perform replication studies?
hga: A key insight here is that in many fields you can implicitly confirm results from a study by basing your own research on them.  If the foundation is rotten, you should be able to figure that out sooner or later, which will lead you to trying to replicate the original results---initially, to see what you're missing---and from there you are in a position to falsify them.