I say as long as you have the financial means and time, as well as the inclination, then feel free.
But love doesn't feed and clothe a baby. And it certainly isn't needed to produce one.
Though really I don't think you even have to have a second person - well, if you're a woman anyways. Just go for invitro and skip the bar.
Marriage isn't for the child, it's for the parents.
Although everyone will probably assume you're married anyways, unless you don't live together and hardly see each other.
Then they'll assume you're divorced.
Of course, I'm a *bleep* child - my mom had a very bad first marriage and decided "never again" so my dad and her never married but had four kids together just fine.