My own personal opinion is that one should spend more time practicing their music than buying and selling their equipment since a competent musician could make most average keyboards sound good anyway. Beyond a certain point the difference in entertainment value from various equipment becomes marginal.
This is NOT a reflection on Dnj. Just stating a "personal opinion. When you're given the gift of music, you have a responsibility to nurture it and use it to make the world a happier place. Not everyone has been blessed with the talent that we've all been given!