I just pulled in $500 the other day by signing up for an American Express card for my wife, and a Chase Ink card for my business. I’m planning a trip and we are paying for it all by using the sign-up offers. There are also no annual fees on these cards. So I recommend taking advantage of a few signup offers and you’ll easily make $100 (if you qualify).
If you regularly buy domain names but fail to use them, you can always try to sell them for a profit. Selling domains is ultra competitive though. If you own a one word .com domain you’ll have a better chance of selling. Words that have high search volume sell well too. Also, domains that are on trend at that moment have a better chance of selling. For example, a year ago fidget spinner domains were an easier sell than they are now. You can sell your domains on Go Daddy’s Domain Auction. Look through the domains with the highest bids to see what type of domains sell well. It’ll help you know whether or not the domains you have are worth selling and how much money you can make selling them.
Honestly, however, this may not be very realistic for a lot of people. I wouldn’t count on this if you’re trying to make your rent, and you’re putting all of your eggs in one basket. First, someone has to look at your location and listing photos and say, “Sure, I’d like to stay there,” and that may or may not happen within a month. It may never happen.