I don't think it's about price. It's just the way the software works. Vector vs pixels ...work differently when transformed and everything. if you want different, go for toon boom software. that's what disney currently uses in their 2d animated films.
flash is just more efficient for what it's used for. being able to scale, and transform etc while photoshop is efficient with high quality still images.
i haven't used toon boom but that may be a slightly mixed version of flash/photoshop with the different speeds and capabilities of certain features