Hulk was 9 feet tall I believe in the Ed Norton movie, but HT is not slave to scale, the Predators are 8' feet tall but the figures aren't scaled properly to reflect that, so no telling if a Hulk would be true scale or just a bit bigger than humans.
An accurate scale Hulk at 8' would be crazy IMO. It would be to big and cumbersome and wouldn't fit in my Detolf.
I am fine with Hulk being 'out-of-scale' assuming:
1. Hulk is larger than normal scaled figures (height) aka a Predator
2. Considerable muscle mass (width).
A different height and width scale will keep the illusion of a giant green goliath. If that is what needs to happen to bring about a Hulk then count me in for a Hulk not accurate to scale.