if you want to see bitcoin as a currency then it doesn't matter how much it is worth. you buy $20 worth of bitcoin and you spend $20 worth of bitcoin. if bitcoin is worth $20 you get 1 bitcoin and spend 1 bitcoin.
if it is worth $1000 you get 0.02 bitcoin and you spend 0.02 bitcoin.
where the rich come in, i have no idea

I don't think that bitcoin is for rich people only. Its just that its a business even a poor or an average people are welcome in bitcoin community.