How badly emotionally scarred are they?
Multiple relationships = multiple sexual encounters.

Unlike men, women invest emotionally in their sexual encounters. It is the way their brains are wired.
But for every failed relationships, the woman risks damaging her psychological and mental health.

This makes her very unsuitable for marriage as her relationship failure increases, and the burden on the final person she marries is extremely high.
The guy who actually buys the package will suffer being judged by the woman based on her past bad relationships.
That's why, most men tend to avoid damaged women, and they tend to be in the 30s by that time.

This is why men avoid women in 30s because they're too emotionally scarred by that age if they're not married by that time.

Women in 20s tend to less damaged and are still emotionally healthy, in addition to the attractive physical features.
So do you men think it is worth fixing emotionally damaged women, or completely bypass them altogether?
All the advise I've read online is, no matter what, always avoid those women who've been badly hurt before because the price to pay is too high emotionally to be with them. You'll always be blamed eventually.

Always start with mentally healthy dating partner.
Mentally healthy women is the key to healthy relationship and family.