Do you want a motivated and highly educated worforce and otherwise high-infrastructure state?
X Yes _ No
Do you want to pay taxes to support it?
_ Yes X No
But I still believe in taxing the rich, since they feed off society at least as much as they contribute.
The issue in Washington State is:
* Do you want to create a state income income tax where none presently exists? _ Yes X No*
Why not? For the same reason other posters have noted: Seattle has a thriving startup scene, and its comparative advantages over California are a) no income taxes; b) you can live in Seattle and not have a car; c) you can buy a condo on a vaguely normalish salary, unlike in much of L.A. and Silicon Valley. If you remove a), you've mostly got a state where the major city has weather that most people don't especially like and a taxation system that punishes the creation of wealth.
That's bad.
Paved roads are really cheap, and are a tiny fraction of the expenses of the state. But they let them go to hell, even though they have plenty of money to keep them up, because people notice broken roads and you can extort more taxes from them this way.
Its the oldest trick in the book.
So, talking about paved roads as a reason to create a whole new tax and remove one of the few decent things about the washington business environment is disingenuous. I'm sure you weren't being disingenuous, but the politicians who bring it up are.
ftp://ftp.dot.state.fl.us/LTS/CO/Estimates/CPM/summary.pdf
In California, it only takes 50.1% of the general populace to decide to spend a bunch of money, but it requires 66.7% of the state legislator to approve a budget to pay for it.