Spammers increase conversions and activity on the site. I worked for a dating site and they condoned spammers that weren't out of control. Hell, they tacitly approved of hookers working the site as long as they weren't blatant.

If you're looking for a date, take the effort of going out and meeting someone. Online dating is a total waste of time for most people, unless you're looking for someone who sits at their computer all day.