Dread was the first roleplaying system that I used as a game master and I recently had the pleasure to be a player of it remotely. My friend wrote a scenario that was inspired by an SCP article and it was an excellent time for all involved - I even died horribly to some freaky monster and like all good monsters I cannot begin to even describe it properly. Traditionally a game of Dread uses a Jenga tower and has players pulling a block for a given action should their character be under duress or working out of their skill. This lends to a beautifully tense table that blends perfectly with the horror genre that Dread lends itself too, however using a Jenga tower remotely is uncomfortable.
I have found that the role of the Game Master is a challenging but rewarding one. It can be a stressful job which requires forethought preceding - and an agile mind during a game. However the joy of developing this skillset can be felt every time I play. The smiles, laughter, and expressions of disgust or horror on the faces of my friends are good - but I could not tell you if that outweighed the satisfaction and excitement I feel when I finish exploring a new roleplaying game.