Apps administration is a whole different animal. Personally, I think a greater understanding of the database is worth more in the salary department than being an Apps DBA.

However, Oracle Apps is out there. If it says Oracle, it usually ends up in the DBA's lap. There's a lot of maintenance when a new piece of functionality is released, but its not to bad day-to-day. You will question your technical knowlege many times over, but eventually you will get it.

If you want to setup an apps demo environment, you will need either one really beefy machine (512M RAM, 40G disk) to run both tiers, or two decent machines (512M + 20G Disk Each). Installing the software is really simple, configuring it is a different story. Most Apps implementations have dedicated Functional Consultants that set up the business rules that run the system.

Keep in mind that Recruiters are scrambling right now. There's no jobs out there and they will place you in ANY job so they can collect their fee.

[opinion]
If you get Apps into your shop, embrace it. Learn the middle tier. Learn all the web do-dads that come with it. Otherwise, sit tight until the economy starts coming back and become an Expert with the database.
[/opinion]