I am pretty sure that there were several times that Lazlo spent a lot of bitcoin to get pizzas, so it wasn't just that one transaction that he did to use a lot of bitcoin to buy pizzas. He seemed to have had liked pizza.. and perhaps his kids liked pizza too?
In regards to this these where his transaction in one of his wallet in 2010 proving he did more transaction apart' from that 10k bitcoin for 2pizza 
Btc address: 157fRrqAKrDyGHr1Bx3yDxeMv8Rh45aUet
With these kinds of transactions I, there is no way Lazlo won't have lots of bitcoin piled up somewhere. Dude was spending bitcoin like it was really nothing. I keep saying it that before someone will have the mind to spend 10k bitcoin for pizzas he must have more than that. Now I see what he was trying to do clearly when he spent the 10k bitcoin. He made a huge sacrifices for bitcoin to come mainstream. For bitcoin to start getting more public attention. To me Lazlo is a legend. I see the bitcoin pizza day as a day to make sacrifice for the greater good, than a day of regret as many believe it to be.
I am not sure why some of you guys keep repeating the same bullshit over and over and over in regards to supposed great sacrifices of early bitcoiner who were spending coin. 10k bitcoin did not hardly have a price in mid 2010.. and so yes it was in the early days of price discovery, and it took a while for bitcoin prices to even get up to $1.. .. yet surely there were hardly any abilities to transact in bitcoin, and also if you think about it, the earliest of the bitcoin miners had mined around 2.5 million bitcoins every year, so half way through 2010, there would have been close to 4 million bitcoin already mined,.. yet hardly any price... .. so yeah, little by little bitcoin started to get a price, and so if Lazlo might have had more than 50k bitcoin himself at some point around that time... yet there would have still been hardly any price..
We know that in 2011 bitcoin did pass $1 and then it shot up to $32 and crashed back down to $2, so by then bitcoin started to have a price, and by the beginning of 2012 bitcoin had a price around $5, yet maybe by the beginning of 2013 it still was ONLY around $12 per BTC... So yeah, there might have started to spark in the eyes of some guys during late 2010 and into 2011 that bitcoin could have a greater price.. but the number of bitcoiners still was quite niche in those early days.
One thing is measuring the bitcoin price in terms of what it was at the time, and sure it was moving around a lot so some guys might have started to get the sense to start to hold onto some of their BTC, yet also some guys would panic maybe if they might have gotten 10k BTC for $1 each and then perhaps that $10k that they spent might have turned into $200k or some other much higher price in a short period of time, so there could be challenges to figure out how to deal with volatility matters for guys who were fortune enough to hear about bitcoin and to get involved, yet they still might be confused and/or puzzled in thinking about how to deal with such great and uncertain volatility... and we still have similar kinds of matters today with great and uncertain volatility matters even though the numbers are different and the kinds of businesses built around bitcoin are different too... but there still can be uncertainties in regards to how to deal with volatility, considerations about how many BTC that you might have and how many BTC that you want to have, whether you are in a position of newly being involved in bitcoin or if you might have already spent some time accumulating a bitcoin stash.