Lol I'm ahead of the curve. Recently I completely quit riding my fixie because my knee had got inflamed and swollen from mashing too hard. After that I bought two used road bikes to ride. Ahh gears are so nice, and spinning at low gear is so nice, and coasting is so nice too. Also well tuned, and oiled road bike is as quiet as a fixie. Plus energy is used more efficiently in a road bike than fixie. Think of someone on a road bike with cadence of 90 going 20mph while a fixie needs to spin like 130 or something to go that fast.

But other people may have own reasons for fixie riding. Like in a city, I think a fixie is more safer than road bike. You are more aware of surrounds with fixed and can control your speed better (accelerate faster when light turns green). Whereas on a road bike you gotta do all that shifting and to slow down you gotta use your hands to hold the brake. I live where traffic is low and streets are wide so I decided a road bike was most efficient way to travel.

But now those maintenance costs are going to bog me down. On top of new tubes, tires, chains, i need to get brake pads, deraileur adjustments. Also if I ever crash, it will kaput be for my deraileurs, whereas on a fixed u just need to readjust the stem.