Thanks for the responses everyone. It was not my intention to imply that the offered pricing was not "fair". As with any major purchase however, when you buy a large number of options it is not unusual to obtain a discount for purchasing them all at the same time, simply because the total margin on the purchase is greater for the seller.
As an example, if I purchase $5K of options that the seller has perhaps a 35% margin on, they might make $1750. If I buy $15K of options at the same margin they might make $5250. The question is would I purchase all of those options at that price. The seller accepting a slightly smaller margin for a larger number of options may sway me to go ahead and purchase those additional options and thus make the difference between the seller earning $1750 versus earning, for example, $4250. I would consider this a win-win situation for both buyer and seller. The seller makes more money and the buyer has the idea that they got a "deal" (and indeed did get a deal).
To be clear, I don't know what the margins involved are and my example is just that, an example.