On the one hand, my success there (and it didn't happen without intention or hard work) would indicate potential for the ability to add another wife successfully. On the other hand, why ruin a good thing if polygamy is fraught with failure?
I remember my Nana (who was married to my Grandfather for over 50 years) giving this bit of advice: Do not marry the person that you think you can live with. Marry the person that you can not live without.
How much more that is good advice for a would be polygamist!
If you can live without her, don't marry her. If you can't live without her, then you can't live without her. And you better marry her. And you might just end up a polygamist.