I used to have only one quad like you, but then I took a quad to the knee...
No seriously, I've had bad trauma experience spending days building my first quad, preparing, waiting weeks for good weather. Then you can finally fly it and after a few minutes turns out something is wrong and you spend the rest of the sunny day trying to fix it.
And those times you are all prepped up, 20 batteries charged, travel to a spot, only to explode after 30 seconds of flying.. And your done.
That's why I try to have at least one backup quad, preferably more. Flying time is also a currency!
Time = Money
Flying time = Gold