The reason more developers haven't made iPad apps is that it's a small market right now. Only a few million out there, compared to like 100 million iPhone-sized devices
Not a valid reason, you want your app to be the first on the iPad to grab as much as users as you can because those users can spread the word about your applications as the market expand. Brand awareness and free advertising is always good. Not to mention as the market expand, the odds of you being able to charge MORE for your iPad app will decrease as the competition will increase to grab those users as well.