Yes of course, however - through analysing our traffic we can see the majority of users that have accessed the site through bitcoin talk still choose to checkout via debit or paypal. We are thinking that a lot of adopters of bitcoin would prefer to hold their coins as they have a lot of confidence in the currency being a 'gold mine'
Depends how you come about your BTC. If I've earned it then I'm usually more willing to spend it and if the option is there I always pay with it. My last purchase was a phone from Cex.