Because the Tyros2 left him near broke? lol Just kidding.. Get what makes you happy. If you feel they are sufficient for your needs who are we to tell you different? Sorry Diki. But Diki brings up a wonderful point and that is since you've already spent an arm and a leg on the Tyros2 why not get some speakers that do the Tyros2 justice? Yamaha has some new MSP5/7 Studio series speakers that are very highly rated (although they are XLR connection type only so you would need to run the Tyros2 through a Mixer with 1/4" inputs and XLR outputs or get some cable adapter accessories that fit the bill) but I'm sure they would do your Tyros2 proud. But once again these are only opinions and advice from the outside looking in. You must be the one to determine if a certain set of speakers suit you personally for your specific purpose. If you have found that in the Roland CM-30's then more power to you.

Best,
Mike