[ryanelkins]

Many developers have the initial gut reaction to build instead of buy. I've found that many people don't really fully understand the ramifications though. Even if some of these places only have 3-5 developers working on this full time - that's still probably FAR more resources than another company, especially a startup, can devote to the problem. You also now need resources to maintain and update it. All of this takes resources away from whatever it is your business actually does.

I guess the hard part is really determining what is trivial vs what is worth letting someone else take over. Some people may look at the above services and feel like they look pretty easy - and then a week or a month down the line they realize there is more to it than they first thought.

Other aspects people often don't think about - dashboards and admin sections usable by a non-developer.

I'm not vouching for any of these services as I have never needed to use any of them, but I would definitely guard against blind "not invented here" syndrome.