Honestly, a lot of people who see therapists do keep going. A friend put it to me this way: you're paying money for perspective and objectivity, and this is especially true for people in relationships. It also takes time and effort to find a therapist who is a good fit for you. If the therapist is not a good fit for you, then there will be little benefit.
I know, I'm pointing out that trains of thought similar to "I was unsure of therapy but liked it and kept going" are not going to be universal because maybe there is some underlying thing that makes you more likely to be helped by therapy.
Uncharitably I've seen this framed as something like "therapists only help people with simple problems."
Therapy has helped me anyway.