@Tarliki, I agree about the logical fallacy - that a person who has been suicidal is still around is clearly not necessarily thanks to suicide helplines, even if they were called.
At the same time, to be fair, you overgeneralised in your first post. Saying you and people you talked to found them useless shows these lines don't always help, but doesn't show that they never help anybody.
I'd say that as is often the case with all sorts of things, the quality of the service depends on whom you get, how well you click, and also a bit on whether they are having a good day or not.
I once rang an Australian 24-hour crisis line when I was in genuine crisis after hours. I was asked, "Are you suicidal?" and said no, but extremely distressed and in a crisis. They did not ask me about my situation but told me to ring someone else. I was surprised because this was not the suicide helpline, it was just called a crisis line, and asked whom should I ring. They told me to look in the phone book, and hung up. I HAD looked in the phone book!
Because I've often lived remote and/or without decent professional services, I've occasionally rung a general helpline of some sort. About half the time it resulted in a useful conversation, both with trained people and with volunteers. Other times you get people trying to convert you to their religion or obviously reading off a script or for whatever reason being unhelpful for your situation.
These services are stopgaps, not like a good continuous professional service. We can discuss the affordability of these and I expect many people don't have money to splash around on these things unless they are subsidised or they have a very well-paid full time job.
In Australia there is now a little more funding for stuff like this but the reality is also that there isn't much continuity with the people you get to see. So while I've been to some good services and had helpful sessions along the way for dealing with family-of-origin dysfunction, things I wanted to deal with in myself, PTSD etc, it's been patchy and I've learnt a lot more overall from DIY, self-education, friends and especially from people telling their own stories, including online.
Anyone here had a vastly different experience in either direction?