How many days did it take you to unlock that many wheel spins.
The game throws wheelspins at you without you even realizing it.
When I came out of the prologue I had 60 wheelspins ready as well. I also farmed Mixer a bit with an old iPad the last week and instantly reached level 18 but those spins are not all from Mixer. Every level-up you get something like a wheelspin, a super wheelspin, a chat phrase, a T-shirt or just some cash.
The most fun in regards to wheelspins is buying those houses that give 10 super spins.
I already bought every house in the game apart from the 2 castles. Saving up for that now, apart from upgrading 2 cars so far, all money I earn is saved for housing first. At the rate I am gaining cars from the initial DLC and now the spins I can't possibly keep up trying the cars out. So far I got 133 cars of which 9 are FE cars (3 FE cars from VIP, 2 FE cars from regular spins, 5 from super spins).
I'm even using all my Forzathon Points to get super wheelspins at the moment.
(but keeping 150 at hand just in case I don't get that Porsche from a spin before the summer week runs out).
(already got the Bentley FE that is on the FP shop from a spin as well)