TnT is quite the expensive resource to make large quantities of, if you ask me. Especially because there are no creeper dungeons so you would have to hunt a lot of creepers in the wild to have a dangerous amount.
I have stacks and stacks of Sulfur from the Gravel, McMMO has the gravel drop sulfur, and I also have it since I have the fishing ability where you can just hit a creeper with the fishing rod and get the sulfur, and I can do that about 20 or more times on one creepers that that more than 20 sulfur per creeper I find.
ITS GUNPOWDER! XD it ain't sulphor, it's Gunpowder. Sulphor is soot, which is also known as sulfate, it comes from ashes and burning coals
or wood XD and i am getting some of this wrong, but still.