There are many reasons to get a patent, the first of which is to protect your invention and retain rights to it. With a patent in place, no one can infringe on your rights as the inventor of the product or the product itself. A patent is a must-have; otherwise anyone could create copies of your product and claim the invention as their own.
Additionally, if you plan to sell your invention to a third-party, the buyer will require one or all of the following:
Note: Many buyers will settle for Patent Pending status if they feel the invention is marketable, because it can take years to work through the patent approval process.
Finally, you are protected for many years and you can sell or license the patent as you could with any asset. You also have legal recourse if someone infringes on your patented product. You can sue for royalties and damages, if desired.