How do you remain focused and interested when playing smaller SNGs?

[Toddy]

I've been playing online for about 15 months now and started as a $6 SNG player, did the grind and have steadily advanced myself to playing $55 and $105 SNGS. Sometimes I'll go and play a $15 SNG, but I lose interest and to be honest I'll make careless plays because I almost don't care about the money (oh its only $67 if i win when I'm used to $248 or $472) because its smaller than my usual buyins. How can I stay focused and be excited about winning any SNG no matter the amount.