I once re-submitted a hard rejected track with a lot of changes: changed the sample sounds, changed the arrangement, re-mixed it, remastered it and I got this response (granted, the quality of your track is far superior):
Unfortunately, this submission doesn’t meet AudioJungle’s commercial quality guidelines overall, and can’t be accepted.
Also, as a general rule, please do not resubmit hard rejected tracks.
Audio must be fully composed, arranged, mixed and/or mastered to a commercial standard, and have reasonable potential utility to our commercial buyers, for their varied projects. Ideal audio submissions should demonstrate the ability to support multiple visual works in general. A higher degree of general commercial viability would therefore be required. Please consider viewing our Top Sellers page to get a good sense of the commercial quality of popular files: http://audiojungle.net/page/top_sellers If you wish to resubmit more content, please review the engineering and composition and make improvements to a commercial standard before attempting to upload again. Thank you for taking the time to submit content to AudioJungle.
Since then, I don’t even considering re-submitting hard rejected tracks. The risk of revoking my right to upload is just not worth it. You can submit them as logo idents, or submit them on other stock markets.
But I also have seen a case where another author’s item was hard rejected and after tweaking EQ a little, it was approved.