I thought from the very beginning that you can get wife how much as you want as long as you can sustain their needs; that's all, nothing more nothing less.
According to Quaran, the God have said that it's allowed to marry up to four wives.
If it says that you can only marry up to four women then why heard cases of marrying to 7 up 10 wives? Having 4 wives is
mandated or just an ideal number but you can still have more if you want?
However, most of scholars are interpreting this as "one is better than four".
Based on your scriptures, it seems pretty clear for me that marrying only one is the best thing to do. Your God already advised it yet many still choose to do the other thing. No offense but for me maybe some of Muslims, just a maybe, do it because of "flesh". You know guys what I mean, the more wife you have the happier your sex life would be.