Welcome to the forum oppyusa. Bherring gave a great reply, and I will expand on it a bit.
Submittal of coins to the top tier graders typically costs money. Whether it be for the upfront "joining" cost with PCGS or NGC, or the grading fees and such with ANACS and ICG. Most people will get an approximate value of their coins to start with, and then determine if they want to submit. If a coin routinely sells for $15, why spend $30 for grading and shipping fees. The times you see low value coins in slabs are usually the result of the large volume dealers and or places like the Coin Vault on tv that get very big discounts due to the sheer number of coins they submit. Some coins take a pretty hefty jump from one grade to the next, so people will also speculate and hope for the high grade only to get a coin returned with a low value grade attached. Know your coins and the series you are submitting or you can easily fall into this category.
Another reason to submit is merely for authentication. Typically, if authentication is needed, it's probably a higher value coin to begin with, so the fees aren't as important.
So, people have been slabbing coins for a long time, so in essence the supply is already out there, and just being passed around. Add to that all of the new coins being slabbed, and it continues on. As for when, I agree with bherring as well with $100, although I think I would venture a little higher into the $200 range before I would submit unless I just need some "fillers" for the order.
Submittal of coins to the top tier graders typically costs money. Whether it be for the upfront "joining" cost with PCGS or NGC, or the grading fees and such with ANACS and ICG. Most people will get an approximate value of their coins to start with, and then determine if they want to submit. If a coin routinely sells for $15, why spend $30 for grading and shipping fees. The times you see low value coins in slabs are usually the result of the large volume dealers and or places like the Coin Vault on tv that get very big discounts due to the sheer number of coins they submit. Some coins take a pretty hefty jump from one grade to the next, so people will also speculate and hope for the high grade only to get a coin returned with a low value grade attached. Know your coins and the series you are submitting or you can easily fall into this category.
Another reason to submit is merely for authentication. Typically, if authentication is needed, it's probably a higher value coin to begin with, so the fees aren't as important.
So, people have been slabbing coins for a long time, so in essence the supply is already out there, and just being passed around. Add to that all of the new coins being slabbed, and it continues on. As for when, I agree with bherring as well with $100, although I think I would venture a little higher into the $200 range before I would submit unless I just need some "fillers" for the order.

























