How much are 1st appearances worth?

In the past couple of days Comic books have broken records in auctions. Until this week the highest recorded sales price was for $317,000 for Action Comics #1. Maybe this is a sign the economy is improving but earlier this week another issue of Action Comics #1 (the first appearance of Superman) was sold $1,000,000. It only held the record for 3 days before BAM! Detective Comics No. 27 (the first appearance of Batman) sold for $1,075,000 . So that got me thinking about 1st appearances of some our favorite Heroes and how much they are worth. The values are from comicbookrealm.com . They aren’t in any particular order.