this topic lists other limitations of Lite as well.
http://forums.rpgmakerweb.com/index.php?/topic/8882-rmns-rpg-maker-vx-ace-lite-cook-off/
The full version gives you access to more resources, as well. (Lite only includes a sampling of the RTP resources of the paid full game.)
Lite has the advantage of allowing you to learn to use event with switches, variables, conditional statements and many features new users need to learn. You can learn to manage the database, add your own resources and customize your game. You can plan, write, organize, and do all of the things that will help you become a really great game maker. And then, when you are ready to go forward, spend the money.
I have worked with lot of people who start with Lite or the trial of the full version and my suggestion is to start with Lite and Lite only on your machine. Once you start making your game and seeing what you can do you will quickly realize the game engine is worth the cost and buy the whole thing. =] Your Lite games will all work in the full version.
The immediate purchase of the full version, of course allows you to do all that stuff and never have to upgrade or put up with the little quirks of Lite (The Sample Maps and Database for troops are glitchy since not all resources are included) and counting ten events per map is really a VERY RESTRICTIVE number. You will want to switch over to the full version once you have started to make a game in earnest.
Here are some of the other topics on the subject, for your perusal.
http://forums.rpgmakerweb.com/index.php?/topic/20340-rpg-maker-vx-lite-question/ - this one also deals with the "unexpected file format" problem that occurs when you switch back and forth between Lite and full-version
http://forums.rpgmakerweb.com/index.php?/topic/11876-rpg-maker-vx-ace-lite-workarounds/ - this one also covers "work arounds" and sample games in Lite
difference between rpg maker vx/ace and rpg maker vx/ace lite
comparison between ace and lite
ace versus ace lite
hoping these will catch the forum searches