I presume the reason is that they think there might be something of interest in the pictures.
We're hoping that the Darwin Fueling photo will either support or detract from the hypothesis that 2-2-V-1 is the Miami Patch. Jeff Neville has made the case that it can't be the patch. The testing done by Lehigh Testing Laboratories is not supportive of the hypothesis but neither does it disprove the hypothesis. Some have claimed that the Darwin Fueling photo proves that there were no stiffeners (lines of rivets) on the patch. Conversely, the "oil-canning" that seems to be apparent in the photo seems to match deformation in the artifact.
I can foresee three possible outcomes to the forensic analysis of a max-resolution copy of the Darwin Fueling photo:
1. It might support the hypothesis - in which case it could be good for fund raising.
2. It might disprove the hypothesis - in which case it could also be good for fund raising because it would demonstrate our scientific rigor.
3. It could be inconclusive - in which case it there would be no benefit to fund raising.