• Lifetime employment.
• You never have to worry about hitting your head when you stand up.
• Even if your son is a complete jerk, you can count on a five-headed dragon to keep him in check.
• You always win limbo contests.
• You are your own boss.
• To amuse yourself, you can drag unsuspecting young people into your dimension and laugh as they try in vain to get home.
• You can come and go as you please, talk nonsense, and walk on water/lava/thorns.
• You can be bald and have long hair at the same time.
• Since what you say never makes any sense, you never need to know what you're talking about.

And the number one advantage of being Dungeon Master:

• Three words: Senior Citizen Discounts