if you are using bitcoin then maybe today 1 apple is 0.0008 btc , but tomorrow with 0.0008 btc you can buy 2 apples, but if no one used bitcoin for shopping then there won't be any shop that will adopting bitcoin anymore
so what will be you choice?
In my experience price for the same thing varies on different places. Before I buy anything I check prices first in shops close to me, then I look what is the price in other cities (here I always count delivery plus) and internet sale, I choose place where I have best price and terms. I don`t care so much which of the currencies I will use as much as I care about above written, and for now ebay, amazon, even some things in shops in my city same thing are cheaper then same thing for bitcoin (I didn`t try purse.io where we can buy giftcards for bitcoins and spent it at mentioned sites). I hope that will change, and bitcoin shops will need to think about making some discounts if they wish to attract customers.