I don't think there is anything "wrong" about it necessarily. But I would make sure you keep everything in widely supported formats and stick to the services that allow for easily moving the data you create and care about around. This is Apple specific advice however, I advise the same for anything where friends/family plan to create and/or store data. A walled garden is only really bad if you don't have a way to get out of it ahead of time should you need to.

I don't think the iWorks suite is very popular, and I have read of some folks getting burned by format incompatibility some years ago when Apple updated the suite I don't really remember the details.