Selfish, actually. It's not in the best interests of the child. If you are independently wealthy, and can stay home 24/7 with your child, it's still not in the child's best interests.(they need male and female role models) If you have to work, you'll need a daycare you can afford (good luck!) on a single salary, one that has extended hours so that you can commute to and from work. You'll need to pick up your child after a hard day at work and run errands...bank, grocery, etc. If you've never taken a hungry, tired child grocery shopping, borrow a friend's and make the effort to find out how much fun that is. And hope your job is flexible enough so that when the daycare calls to say your child just projectile-vomited, come get said child NOW and keep him home till he's been fever-free for 24 hours...AND you have to pay the cente anyway, even though you're not earning a cent...you don't risk losing your job.
Many people are single parents and do a great job. Most of them would not recommend choosing to parent singly. Mostly you'll have a child saying "so, why'd you have me, all you do is dump me in day care?"
A thought to consider: what if you have twins? Or a child with special needs? Even if you only have one healthy child, your time with that child will be so limited if you work. Having a child you know will struggle (for attention, for financial reasons, for lack of identity) because of your desire to please yourself is just wrong.