I'm fairly new to mining etc so can someone explain to me:

- why do GPU enthousiast always complain they would love to mine coins but can't because of asics, if the aim is to get hold of some coins, why spend money on a rack of GPU's and mine for months in a row instead of just buying loads of coins for the same amount of money ? is it really all about the joy of mining with a GPU, as in a hobby-thing ?
- why are asics considered a risk for centralisation, if a GPU only pool would have the majority of hashrate, isn't that just the same risk for centralization ?