I have a rochelle concertina because I didn't have thousands to spend on a high end instrument and I am a beginner. I researched for awhile for a good starter concertina and everywhere I looked I was told that the rochelle was the best cheaper starter concertina because its not just a starter concertina and it can do anything that a high end concertina can do. So mu question is, why should I upgrade in the future? What makes a wakker concertina $2000 more than my current one?