Also slightly of topic, but besides Credit bonus whoring you can also add the art of Gift Card whoring. I would not advise anyone to just buy a gift card, but if you know you are going to buy something at a certain store it is a great way to save a few extra $$$. You might be surprise how desperate some people are to sell their gift cards for cash. I use it all the time to reload my Starbucks account (you get a $100 for about $85) or for the pet lovers among us, you can often scoop up a petco or petsmart giftcard for a 20% discount. I use Raise (https://www.raise.com/buy-gift-cards) but there are more websites out there.
For the first time users, you might wanna try promotion code RAISE75AF for an additional $5 off.