It was easier for rich people to get their accountants to help them avoid regular taxes which included sales tax, which was the main argument or benefit of GST... so that at least the rich have to pay some tax (or pay 10% more tax than what they were getting away with before).
Unfortunately, the GST was meant to replace various state taxes, but the states got greedy and many state taxes were not abolished.
In the end, "vote-buying" spending of governments from both major parties, increased to the point that the GST and remaining state taxes & revenue are no longer enough to cover state budgets.
And of course, like the Federal Government, if you can't afford your spending, raise taxes instead cutting back on the spending.![]()