Yes... in this case you are. You are paying more for early access.
Where exactly does it say that?
The Potato chip someone hands me because I say I am hungry has standards. What heavenly celestial body don bequeath this most hallowed commandment?
The potato chip is a physical object and a consumable product that may be found in a situation where its consumption is mandatory, and represents a potential health hazard if not made to standards.
The early access to a game project in development is a voluntarily acquired, purely virtual service provided for purchase at the customer's own leisure, that allows said customer access to in-development material, assets, and/or builds of the game project in question, before that project is scheduled to officially "go gold", acquiring "Released" status - and while the "Released" product has to conform to given rules, especially in regards to advertised features, an "in-development" version may and is very likely to lack any number of the proposed features, and may likely contain errors that would not be tolerated in the "Released" product, by virtue of being in development.
The in-development materials and builds no more
have to conform to any given standards than the developer
has to be able to afford to waste time to make them conform to those standards. At its most core, Early Access just gives you access to what exists of the game at the current moment. The "standards" if one could call them that, begin and end with whatever Steam requires of a project's stage of completion before being made available for Early Access.
There are things you can reasonably expect, of course. You can expect the in-dev build of the game to be updated regularly as the devs continue working on the game. You can expect status updates, and can expect some manner or method by which you can provide feedback to the developers. But, while being things you could reasonably expect, none of them actually
have to be there, unless it's one of them many rules by which Steam games abide, as long as the final product created by the company is corresponding to the claimed features and descriptions.
And at the end of the day, it's your own call to purchase the game early or leave it for later. Nobody is coaxing you into anything, and you have the right to do research on it. If it really does cost more to purchase the early access game than the full game... well, then that's doubly true, isn't it?