Clothes cars and insect repellant share the same status in most states and in my experience all are subject to sales tax.
As far as those making a million and living in middle class housing, that seems to me a personal choice. I guess they are saving a lot of money. But I would guess they are buying a lot of things too, those items are taxed. Anyone with the means can live where ever they want and are taxed the appropriately for that property. It is the fault of tax system in TX if they arent getting the appropriate tax revenue from those tax payers.
When I lived in TX I thought govt services seemed to meet people's needs and I didn't think I was taxed unfairly.