The more I explore the world of crochet design, the more similarities I find with other arts. Although perhaps it may become big business, at the beginning it's anything but.
Writers submit proposals and writing samples to prospective publishers. Crochet designers submit proposals, swatches, and sketches.
Visual artists, such as painters and photographers, show their work in galleries and sometimes craft fairs to gain sales. Crocheters use craft fairs and consignment craft shops. These require finished product as inventory and usually booth fees. Depending on attendance, there may or may not be a return on the investment.
The whole 'starving artist' scenario may apply as well. A designer that's just starting out pays out of pocket for yarn and postage, and then waits for months sometimes to find out if they will get paid for it or not. A musician will work on new music between gigs. A crochet designer must also continue forward on new designs for the next submission.
The old adage of "If at first you don't succeed, try, try again!" must be part of the crochet designer's mantra. Without it, discouragement will set in. If you look to the other arts as inspiration, you will note that persistence does pay off.