This is in answer to 'Why should I lucid dream? What good is it?'
So together with some others (eg AcidBasick), we've compiled a list for you
Remember that virtually anything is possible in a lucid dream - so there are no limits

1 ) Its damn fun, and brings enjoyment ... hell if you dont think dream sex is good, something is wrong !
2 ) You can overcome your fears and nightmares - which falls through to waking life (fears = nightmares = fears)
3 ) You can learn a lot about how your mind works, your subconscious, and a bit about 'awareness'
4 ) You can investigate stuff like OOBE and AP for yourself, if you try hard enough
5 ) You can investigate stuff like 'unlocking memories'... although this can be dangerous too
6 ) You are more likely to experience anomalies like shared dreaming. In fact, my wife managed to cause one...
7 ) You end up with interesting hobbies to impress others with
8 ) You can learn about yourself and your reaction to situations that would never occur in real life. Eg - change your gender, be president or welcome aliens...
9 ) You can learn and practice for physical and mental activities. Such as playing a sport or figuring out a problem. LaBerge's research suggests that signals from the brain to the muscles involved in these activities are identical to waking life.
10 ) You can experience things that you otherwise would not be able to in waking life - even your greatest fantasies. Travel to the distant reaches of the galaxy, go on that dream vacation you've always wanted, or swim deep under the ocean. Similar to ( 8 )
11 ) Waking up from a successful lucid dream can change your entire day. It can put you in a fantastic mood.
12 ) You become more 'sensory aware'. Your whole life, including lucid dreaming, can become an intense experience.
13 ) It can inspire creativity. One can get many ideas for art in dreams.
14 ) You can use it to get a different perspective on a challenge or obstacle in your life. You can converse with yourself in a very real environment.
15 ) You can grow spiritually, by expanding your mind to understand those perspectives that your normally would not (by experiencing them in 'interactive' dreams)

Each of these points has its own research and growth potential
Take ( 13 ) for example, you could create poems and essays straight from the subconscious! (Take a blank paper, think of a topic and have the topic get written to the paper - and read it)

Hope that inspires

PS: Check out the Lucid Experience Checklist for some ideas (some silly, some not)
Also check out the research team section for some experiments you could try