I met a guy who I'm about 99% sure was also schizoid. We got along pretty well as friends in that we both hated parties and were able to avoid talking to other people by talking to each other. It was nice not to be treated like quite such a freak by everyone since I was "in a relationship" and it was interesting to see reflected back to me exactly why I piss other people off so much. But the fact is, that it pissed me off a bit too after awhile. I had to make all the decisions because he just didn't care either way about anything, didn't really want to do anything, would just walk away in the middle of conversations, would go days without speaking to me but would pop up whenever he needed a favour...
I'm pretty sure he was close to asking me to move in with him after graduation but I just didn't want to do it and froze him out until he moved to another city and I never saw him again.
The fact is that some of the core schizoid traits are just fundamentally unlikeable and unattractive. It kind of sucks to ask other people to put up with that level of rudeness, passivity and disinterest and I'd be really suspicious of anyone who was willing to tolerate it. And I'd feel constantly guilty about inflicting it on other people but wouldn't be able to help myself.
So for me, I just think any kind of relationship is a bad idea, whether with other schizoids or not. But your mileage may vary.