The breakeven point for the $199 fee is just over $1,300 in grading costs, 1,300 X .15 =195. So once you spend $1,300 in grading fees you have covered the $199 cost. How many coins or submissions that would take depends on the tier you are submitting under, the less expensive the tier the more coins you would need to submit to reach the $1,300 threshold. If you assume only submitting under the current standard tier rate of $40 per coin you have to submit 33 coins to reach the breakeven point. However, the express tier would cut that number in half at $80 per coin, and if using the walkthrough tier, you only need 8 coins at $175 per coin. So, in general you would need to submit at a minimum 9+ coins to see any benefit from the 15% discount afforded to a dealer account. That sounds simple, but unless you are sending in a ton of moderns, errors, or US mint release coins it could be difficult to come up with enough classic coins worth the cost and time to submit to make it past that breakeven point.