What I've found with long domain hacks is that they really struggle to achieve any value at all. I obtained flatfee.hosting from a junk portfolio buy (Something like 40 cents a domain name) thinking it would achieve a few dollars at the very least. Unfortunately the issue you'll find is you have one or two people looking for something like this (Everyone who wants a Credit based domain name probably has already started a business in the industry). Another issue is the word- guaranteed. It's a good word but if you're looking for a domain hack you're probably going to want something easier to say and quick to type. Think something like "fast.credit" "easy.credit" or "cheap.credit". 10 or 11 letters, easy to remember, etc. For these reasons I don't think it would achieve any more than a dollar or two should you try and sell it, but most likely you'll be selling it to another reseller. I started a side business on my long hack so I could offer hosting with my web design services, but if you're inclined to develop some of the harder-to-sell doamin names I think it would be much harder to start up.
Hope I've helped!