By registering, you become more legit as a company, and there can be other people who can be involved. If you’re a consultant, for example, and you register as a company, there may be other consultants who may want to join your company. There’s that flexibility. And those who have registered their businesses as corporations can offer their services to multi-national companies that typically prefer to deal with companies rather than individuals.
Financially speaking, the amount of money you should invest in such a business would, of course, depend on the type of business. But definitely, it’s not as much as being office-based. You’re paying for equipment that you are directly going to use, in contrast to being in an office where you pay for utilities like rent and electricity separately.