1841 O Seated Liberty Dime -Is This Not Worth Grading

Oh, I bought it for $72.

Thanks coinfrog, That is where I saw it, but does this deep scratch dramatically lower it?

My opinion. The seller was not in the wrong at all. In your picture, without magnification, the scratch is still not visible. No reason to assume that the seller was trying to hide anything.
I also think you got this for a good price. But I see no reason to get it graded.

Here is where opinions come into the discussion.
My opinion is that the only reason to get a coin graded is to increase its resale value. If you plan on selling a coin, even if that is not an imminent plan, and the price of said coin if sold raw will be notably less than the price of same coin sold graded minus the cost of grading, then it is worth grading. I don't see that being the case here. I could be wrong about my general view on grading, and I could be wrong about my application of said rule to this particular coin, but that is the logic behind my answer.

If a person wants a coin in a slab b/c they just like having slabbed coins, then fine...no problem.

But a person who is going to get a coin graded to sell it will be disappointed and lose money unless they understand:
1. Some companies require a membership that will add significantly to the cost of the slab. Check the company policies.

2. There is no verifiable science at all behind grading. A slabbed coin only shows the opinions of the graders...and this can vary depending on all the factors we humans face in life (bad day?).

3. A slabbed coin broken out and resubmitted even to the same company is never guaranteed the same grade again. In other words, the assigned values paid disappear when a coin is broken out...the prices paid are not about the coin itself, but about the coin+slab+label.

4. Not even the most experienced dealers who live, eat, drink, breath and sleep coins can tell what a grading company will assign to a coin...again...its all subjective. Watch youtube vids of *dealers* getting back coin lots and not understanding why the company did what they did. It is a gamble.

5. Take into account any selling fees such as ebay fees and Paypal fees.

6. Know the grade that the slab must show to be worth enough to cover all the above costs mentioned.

This is NOT saying not to use the companies.
It is saying that the very mistaken but prevalent mindset that collectors need to look at every coin through the glasses of "is this a slab worthy coin?" is what makes a lot of disappointment ($ loss) for submitters of coins, and a lot of business for the companies.

Proof of all of the above this is the huge amount of face value coins in slabs and the amount of existing slabbed coins not worth the cost it took to slab them.

Just be educated and do the homework.