Don't know about "Internet dating",but with dateline,you filled in a questionaire,so usually all the contacts had to be qualities you liked etc. so that narrows down the odds,if you like,of "clicking" with someone.
I didn't want to meet a Smoker for instances (as previous H was a Smoker)
I got sent 6 names as often as I wanted them,and made contact by phonecall,so I got some idea of what they were like.
I joined when my DS was a year old (split up from H when I was 3 mths pg)met loads of people,but no-one that I could have a relationship with.Was a member for 18 mths then gave up.Rejoined when DS was 5yrs old.
Just think of all the males you come across in your life,work,friends DP's,Ex's etc. very few of them would make suitable partners,so thats why this can take time IMO.
You gotta "kiss" alot of frogs etc.but at least with this you aren't "waiting" but "narrowing down the odds" and the waiting time !!!