Well, who wants to be married to an NPC? They won't fight with you...or insult you on irc. Likewise, they won't demand gifts and spend your hard earned credits. And again, they will never leave you sad, humiliated, and alone.
However, only a PC partner will say 'I <3 U'. *sigh*
You may find the competition a bit tough though, some people are really desperate. I used to know a female Gand (named Thomas, both IC & OOC) that was always receiving credits and other gifts from potential suitors.
Or else let it go too far, find yourself someone nice in-game, like Lilith or Leigh, court them, swap RL details, meet them in RL, find that they actually look like their IC portrait, fall in love, confess that you're actually a billionaire, marry RL and IC, have lots of babies and live happily ever after.