Yeah, I like keeping them and going through them when I have a chance, but I hate it when they are in the inbox like they are important mails.

I added a filter called "Ads". I add all websites that send me advertisement, such as groupon, macy's, newegg, priceline, etc. Have those messages automatically sent to this folder, marked as read, and removed from inbox. At last, most junk mails are gone.