Not worth it to be honest. Better to wait for 2-3 months if you can. The performance gap between the 3080 and 2080Ti will definitely go up to 40% as the drivers mature. And there's a 20gb version on the way [emoji6]
Would be better if you sell it to some hardware repair shop instead of an individual. It's definitely not worth 15k given the problems associated with it.
Its not just maybe for 3070 since its not just Raytracing but an overall performance gain over 2080ti since Nvidia did manage to double the Cuda cores as well. Let alone the performance gains as the drivers mature [emoji6]