Not sure why people are getting stressed about this. There is bound to be some drop out as things get closer to completion (and more people trying to get onboard as more details get out).
Playfield artwork is always going to be a really personal thing. I actually prefer photoshop art to a lot of classic 90s games. Take a look at the artwork on say IJ, eyes on the wrong level and a Nazi who looks Chinese. However, other people love it.
With Predator I'd rather SKIT-B go with their vision than try to please everyone. Realistically with only 250 made and just a handful coming to the UK the chance of me playing one would be minimal, so I got on the list.
Worst case scenario, I get to own my first NIB, play the crap out of it and then sell after a year or so it if it doesn't tick my boxes. Best case, get my first NIB, play the crap out of it and keep it for ever. (obviously hoping for the second....)
For me the theme and the call outs made it an easy decision. I don't expect it to do the same things as a machine for twice the money but it's a machine that's clearly being built by people who care and is going to be the only Predator themed machine out there.
Oh, and £3500 ($5000) compared to £7000 ($10,000) for a LE Metallic in the UK is a pretty big difference when I come to justifying it to the other half.