Compared to Lampropeltis Drymarchon are not as easy to breed. An 8 year old can breed kingsnakes. LOL All the Drys are trickier to breed. One the copulate in the fall to winter and ovideposit in the spring. Easterns can be cooled but YT and BT you can't drop below 70. They have a considerably smaller range of tolerable temps. Over 85 for prolonged periods can be fatal. Basically feed up while they are eating but fat snakes don't make good breeders. Drys do have considerably higher metabolisms than Lampros though and can eat a lot without becoming fat. YTs and BTs are about equal when it comes to breeding. I think one of the most important aspects for them is they breed during the rainy season so regular misting encourages this along with dropping temps down into the lower part of the range. Being snake eaters like Kings it's important to introduce the male and keep and eye on things.

For investment purposes you would be better to spend the money on YTs as they command higher dollars for babies.
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BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
1.2 P. m. melanoleucus B/W N. J. Northern Pines
1.2 P. d. deppei Mexican Pines
2.2 P. l. lineaticollis Linis or Lined Pines
1.2 P. m. lodingi Black Pines
1.1 Drymarchon melenurus Blacktail Cribo
1.2 M. s. cheynei Jungle Carpet
2.6 L. p. pyromelana Arizona Mt. Kings
1.1 L. g. californiae B/W Cali kings
0.0.3 M. f. flagellum Eastern Coachwhips
1.2 G. m. bottegoi Western Plated lizards