[sigtstp]

It still largely comes down to incentives from what I've seen. A lot of times all anyone (from the researcher to the reviewer) cares about is the paper. Journals don't check that code actually works, and a lot of researchers don't spend time on preparing their code. They feel there's no need, since they now got a new article on their CV. It's true that they may not have the skills and experience to produce good code they can share (depending on the area), but often 1) there's no time to prep code since they've got 3 other projects going on and a crazy work pace 2) the code is seen as something incidental and secondary - what matters to them is the figures and results 3) some groups want to milk a topic for a few papers so they're guarding their code and data. Luckily at least plenty of journals demand access to data or even making it public.

[staunton]

In fact, there's even more incentives for researchers to make reproducing their work as hard as possible. For example, what if someone tried to reproduce it and found contradictory results? In both cases (reproducer made mistake, original made mistake) it's additional hassle that the original authors can basically only suffer and never gain.

[edgyquant]

This is just you confirming that tons of research is essentially fraudulent. If it can be contradicted it absolutely should be, that is how fields progress and weed out bad ideas.