The Weekly series, which reprint the original run to issue 52, are not really second prints, per say. There are only 6 true second prints of the original release, 2, 7, 8, 33, 34, and 50. I think the unusually high prices seen on those particular Weekly issues, won't justify grading in the long run. 1, 19, and 27 may see decent prices later on, but most issues will eventually dump
I know most people in the know, do not care for the Weekly series, and most avoided it. It was Kirkman milking the series, and it detracts from the original release. If you can get the mentioned issues in 9.8 raw, at cover price, I think money will be decent for the time being. Problem is, they are mostly abused. I'm about 3 issues short of a complete Weekly 9.8 set, and it is getting harder and harder to find gradeable material