What you notice does not mean that it is predominant. I avoid buying using bitcoin fees are higher and confirmation times are longer.
altcoins outperform tbitcoin quickly, fail against volatility.
I need about 20 confirmation which can be obtained within 10 minutes instead of waiting for an hour or a quarter of an hour.
The sites prefer bitcoin because it has a fixed and escalating value, which means more profits.
Thats why you dont like bitcoin because of your experience of using a bitcoin. Thats true bitcoin fees sometimes are so high and need so much confirmations to get in your wallet. Yes many sites accepting bitcoin because of that and we know that bitcoin is most profitable than other coins. Thats why many people buying bitcoins for saving and waiting the big pump of the price.