saitins - two things. First, there's a save editor that you can use to get your progress back. All you need to do is search for "clicker heroes save editor" in google. The second thing is that you can manually save your game locally as a text file by clicking on the wrench in the upper right corner and hitting save. If, for any reason, you need to go back to that save, you can import it through that menu as well.
Piggy, the only way to get diamonds without paying is to sell something in the auction house.
However, you can get CG's, which can be used in place of diamonds for most things from your mine and from levy's.
They always say something along the lines of "Thank you for your idea. We will submit it to the devs." Nothing that anyone here has ever suggested has ever been implemented to my knowledge.
@randomace
I'm probably being cynical, but I'm also being realistic. Our devs are going to botch any good idea that passes to them from their players. Personally, my thought is that you should just keep hoping and wishing :(
No offense intended.
@Anlasist
No. The only ways to get rid of an item are to sell it, either in AH or the shop. Selling in AH means that some other player has purchased it, and you receive diamonds. When selling in the shop, the item is destroyed, and you receive gold.
@massmurrder
I stated that he upgraded his marketplace to level 30, thus UNLOCKING the auction house. Clearly, you have not done so. Elsewise, you would have learned that Oblivion Books and Victory swords are nothing compared to the higher level gears.
@massmurrder He's not hacking. He probably(99.9999%) upgraded his marketplace to 30 for the auction house, then bought gear at +200 or something. It's not hacking.