Because Intuit is more greedy a corporate than Costco.
The online version allows you to e-file 1 federal and 1 state return, at the cost of $110.
The Costco version allows you to e-file 5 federal and 1 state return, at the cost of $70. And it also allows you to paper file unlimited number of federal returns.
Obviously, no one should buy the online version of the Turbotax.
