Probably not, but I heard you do not have to pay for webhosting, and all the other fees which come with owning a website. You just have to split your earnings.
Cafepress stores are pretty good for making T-shirts and other items like clocks, mugs, and other items if you have a large fan base/potential customers like some popular Youtubers with thousands-millions of subscribers. It might also be good for raising money for forums with a lot of loyal members.
I guest if you have a graphic design, or art degree from a college. You can use Cafepress to earn extra spending money.
I believe with Cafepress they just let you upload your logo or designs for your shirts and other things, and they make your shirts by printing your logo on their shirts.
I heard a lot of the Amazon Marketplace and Ebay stores made by people actually buy from a wholesale warehouse like Costco whenever someone buy a product, and they sell it for a higher price on Ebay or Amazon Marketplace, or they help other people sell items and get a commission and don't have to buy the item themselves.
The store owner is just the middleman between the buyer and the warehouse which needs to sell its goods sort of like new car dealers where you can't just go into buy a new car. You have to talk to the dealership about buying a new car, and the dealership talks to the car company which will send the new car to the dealership, and both the dealership and the car company splits the earning.