The beauty of well-designed tax software is that most filers won't need to pay extra for expert help. All of the answers you need should only be a few clicks away, and if you need technical assistance (help with the software, not tax-related issues), support should be easily accessible.
If you find yourself constantly wanting to speak with a human tax expert or if you know your tax situation is complicated, you may be better off selecting tax software with tax expert support or simply hiring a CPA, or certified public accountant, on your own.