As others already pointed out, there is no incentive to do so.
Consider: "Hey, look, I went on top of tower of Pisa and threw down two identically shaped balls, one iron and one wooden. They dropped at the same time!"
The above is the expected result and would only be interesting if the result is different from expectation. Now, if 1000 scientists did this and each published the confirmation of what we knew would happen then who would read that? But, if one scientist said: "I tried and they drop at different times!" that would be different. The 999 scientists would then try to replicate again and then the papers of the 999 would be interesting again.
Consider: "Hey, look, I went on top of tower of Pisa and threw down two identically shaped balls, one iron and one wooden. They dropped at the same time!"
The above is the expected result and would only be interesting if the result is different from expectation. Now, if 1000 scientists did this and each published the confirmation of what we knew would happen then who would read that? But, if one scientist said: "I tried and they drop at different times!" that would be different. The 999 scientists would then try to replicate again and then the papers of the 999 would be interesting again.