To go Dual Layer or Stay Single Layer

I’ve been putting Upscales of Deep Space Nine and Voyager on Blu-ray. I am almost done with Deep Space Nine, and I put them on Dual Layer discs, and I get 4-5 episodes per disc, 3hrs and 45 minutes with an average of 20mb/s bitrate. Each Season comes out to 6 discs. not too shabby.

Here is the issue, each Dual Layer Blu-ray Disc averages at $1.70 per disc. No matter what brand I look at, they are around $1.70 a disc. Single Layer discs average out at 40 cents a disc, get a similar bitrate with 2-3 episodes.

Is it worth going with dual layers for Box sets aside from reducing disc swapping? Going Single layer would only increase disc count to 9 discs a season rather than 6. What are some of the benefits of doing dual layer?