My question is: Why are there verbs with so few phrasal verbs containing it?
Please, I will appreciate if you correct my writing.
You can't use the phrase "It turns out" if the only reason "it turns out" is that you've done it. It is used for a happening that you didn't know about until later. For example "I was going to answer your question, but it turns out that someone has already done it".
To your question: "Sue" means to litigate against. Given that in phrasal verbs, there is usually some meaning issuing from the verb, surely you'd expect "sue" to make fewer phrasal verbs than "get", "take", etc. which have multiple meanings.