To me this all leads back to the bigger issue that points really don't mean anything beyond gaining access to certain levels. I believe that the points system should be eliminated and replaced with something else. Maybe how long you've been active on the site gives you more access. I'm sure it won't stop all the point farmers but I feel it would stop some or a lot of it. Maybe give warning to members who continue to ignore the rules, and after so many warnings (or strikes), the be banned from submitting images or whatever they are ignoring for a week, then a month, then a 3 months, then a year. It won't lock them out of the site so they can still access other parts, but it will stop them from doing what they are doing wrong.
As for discourging members from replacing or fixing the images or even uploading their own, I feel that is sad. I don't upload my scans much anymore because most of my cards are already uploaded, but I don't have as much confidence in my scanning compared to others. When I did add scans, I did it to help the site, and to help other members find the cards they have. Not uploading scans for whatever reason prevents new members from seeing if that is the card they have. I need to see what cards I have that need adding to help the site. To me it makes no sense to be willing to help the site in other areas but not scanning if you have in the past because of Admin's interpetations. I am in the camp that within reason, any scan is better than no scan (exceptions being photos, half cards, things like that). One reason I stopped doing the cards need cropping was because so many were rejected because the quality was low or not perfectly straight (within reason like 1-5 degrees off). I know this goes against what I said earlier about not helping the site, but it was also fairly caught up at the time so I just found other stuff to work on.
I'm kinda just rambling at this point, so I'll finish with this- if nothing else, help out the site whatever you feel is your strong point. I guess any help is better than no help, but I feel eliminating points would help, and maybe encourage others to submit more scans, even if they aren't perfect (again, within reason).
Royal Card Review is my blog if you feel like checking it out, thanks if you do!- royalcardreview.blogspot.com/
In the process of updating my collection so don't trust any of my lists right now.