If you try to sell a product that is in low demand then chances are that you are not going to get many sales no matter how hard you try. So it is a good idea to spend a bit of time researching and finding out if a product that you are thinking of promoting is a product that your audience needs. If your site gets decent traffic then you can conduct an online survey and easily get input from your visitors.
One other positive about the Ultimate Bundles affiliate program that your readers may not have realized… They actually offer second-tier commissions too, meaning you’ll earn a share of the sales from any affiliates that you refer to the program. In this case, it’s 10% of their bundle sales during their first year as an affiliate which could be a nice earner!