[amateurpolymath]

This stuff is rampant because the incentives are there. Academia values original publications all else. Tenure, promotion, and respect of your peers depends almost entirely on publication in academic journals. Doing replications is not considered original and often raises the ire of more senior members of your field (the ones you're probably criticizing). In fact, making your research difficult to replicate is probably a smart career move --- no one can come along and use your data to publish something better!

Until replicability is required by top journals, and replications are appropriately valued by these fields, you'll continue to see this kind of drek trotted out.

Publish or perish.