L.R.
I sure hope that preschool graduation announcements aren't the new "norm". What's next, announcements when little Johnny goes poo-poo in the big toilet for the first time???
I'm sure you are proud of your little one. You should be. But I really don't think a formal announcement is the way to go. A nice handwritten note from you telling about the event and other things that are going on in your life is fine, along with pictures from the graduation. If people want to send a gift, they will.
But to answer your question, a formal anouncement does seem like you are fishing for gifts. A family update with pictures, doesn't. People can then make their own decisions on whether to send a gift or not. Plus there are many more "firsts" to come, don't want to wear people out!! HAHA
Good luck!