This opens up a realm of possibilities – instead of writing applications for their own use developers can write applications to sell. Who would buy a Facebook application? Well in this particular case it’s a review application for music, films and books – it has the obvious tie in to Amazon’s affiliate scheme so potentially it could generate a nice revenue stream if enough users sign up.
There’s always a risk you’ll never recoup your initial outlay if you bid on a Facebook application, but equally it could be the biggest money spinner ever. Only time will tell, you could never make a penny out of it, or equally you could be laughing all the way to the bank with the developer wishing they’d never sold their killer app!