It depends if I have extra money at the time. Likely many of you, I live on a budget and I can/could/have blown it on figures very easily. If I have the extra cash, yes, I will buy two or three extras, especially if the figure an army builder.
When the commchip stormies were showing up at TRU for $2 and I found several, yes, I bought them but I did leave some behind for other buyers. And when TRU has the 2/$3 sales, yes I hit the local TRUs looking for specific army builders.