That sounds like it's probably fine to me - I've done similar myself, although I think you have to look out for the balance of things you're citing - sometimes it's better to pick good examples rather than fill up on lots of examples. I've only ever used three examples maximum, and only where it's either a particularly important point for my study or a point that's fairly original for the field I'm writing about, not where it's something very common or familiar already. I find it can be tricky deciding which references to use and which to leave out - mostly I try to find a review type reference, or an original reference if the point I'm making has come from one influential source that then influenced the others, or a very recent/particularly relevant reference. Failing that, I try to pick the most important/most cited paper or best known author.
Hope that helps!