It was easier for people to mine BitCoins in the past. If you don't believe this, you are a fucking moron.
You didn't get it.
Of course it was easier, but the price per coin was also lower, so it wasn't more profitable to mine back then.
You were able to get 2pizzas for 10000BTC back then and it took a while to mine those 10000BTC.
If you mine for a while now, you'd still be able to get 2pizzas, so there's no big difference in profitability.
And for the "
very expensive mining-devoted rigs", a Jalapeno is way cheaper than a good mining-GPU, so it doesn't really get more expensive to start mining.
So, what was your point again?