This isn't really what community wiki is for.
It's not a question that would at all benefit from collaborating editing, which is the whole point of community wiki. The question you have so far could be made better by consolidating all answers into one instead of spreading them out. Then making it community wiki would sort of make sense and allow others to edit in other suggestions. But with that said...
In general, "(potentially) endless list of answers" questions aren't a good fit for Stack Exchange. Our Q&A model shines when questions are focused and specific. What you are trying to set up here instead is reminiscent of a shopping recommendation - trying to pick the "best" service.
A better question for SE would be "how do I choose which customization service to go with". Armed with real, tangible knowledge, a person could then go evaluate their options and pick whatever service met their specific demands.