Since the emergence of affiliate marketing, there has been little control over affiliate activity. Unscrupulous affiliates have used spam, false advertising, forced clicks (to get tracking cookies set on users' computers), adware, and other methods to drive traffic to their sponsors. Although many affiliate programs have terms of service that contain rules against spam, this marketing method has historically proven to attract abuse from spammers.
Storage. Depending on how big your business gets, you’ll need ample room to store the books. You can’t get lazy or disorganized about it, either. You have to keep the books in good condition, and you need to be able to find them when someone wants them. For instance, if you list a book in “like new” condition, and then the pages get smashed during storage, you’ll be in a bind if someone places an order before you realize what happened.
This is the classic work-at-home mom gig, but it's for a lot more people than just moms! Selling stuff you love can be a great way to make extra money from home, even if you work in an office most of the day. Direct selling is scalable to your own lifestyle, ambition, and talents. You can keep it casual and mostly sell to friends and acquaintances. Or, if you really get to networking online and in person, you can build a client base outside your existing circles.
Depending on your skill set, you could easily make a few hundred dollars or even a few extra thousand per month. And if you have some money to invest, you could easily launch into a variety of day trading activities. Those present some risks of your original capital. But if you know what you're doing and you work to hedge your bets by placing stops and limits, you could create sizable upside with lower-than-usual risks.