I am brand new to the comic book grading process. I have roughly 140 comic books (mainly Batman) from the 1960s, 1970s, and 1980s. From the research that I have done, there are probably 20-25 key comics that are worth over $100 each in the lot (depending on how they are graded). There may be one or two books in the $300-$500 range. At what value level is it worth it to get a comic book graded? Also, what is a good ballpark figure to get 20-25 books graded by CGC that are in the $100-$500 range each? I tried researching this as much as possible, but can't seem to find the answers. I want to sell the collection within the next six months if at all possible. Thank you for any help you can provide! I have attached pictures of some of the books that I am looking to possibly get graded.