I think you are talking about Laszlo Hanyecz, he did not sold 30+ BTC to buy two pizza actually he sold 10,000 BTC to buy 2 pizza. I want to shed some more light on this for your understanding, he made an offer to sell his 10k BTC for 2 pizzas on this Forum (bitcointalk)! Isn't it awesome. Here. Now coming to your query, if you have such big amount of BTC in your hands then i prefer to not use them for daily expenses. Because in this way you can not make big money but if you have some 0.004 or 0.0004 BTC than My friend do not worry about your future because this amount ain't going to bright it up. Hehe

(No offense) Actually, back in 2010 the price of these 10,000 btc were around $40 dollars and if we buy $40 dollars of BTC today you will get around 0.0013 maybe. To make big money like Laszlo Hanyecz could have made, you need pile of BTC not small amounts. But, if you do have pile of Bitcoins than my advice for you to, not use them.

For myself, i have few dollars in BTC and i do not even want to change them in fiat even though i know at most, if the BTC hit $100,000, i  will make around $450-$480 dollars in profit. That's not a good profit for such a big timespan but something is better from nothing.