From my viewpoint.., (at least from what I've seen on the forum over the years)., I've notice that many just hit their own personal limits.., and drop a board for a new one without ever really scratching the surface of the one they have.
The reality is.. ALL of these arrangers can last a person YEARS.., if that person is willing to explore the many options these arrangers have. However.., you mention the word "edit" or "tweek" to some here and they run the other way. I cannot understand why people here blow through boards so quickly..., especially when 95% of the time the board already has the tools to do what's needed.
I think you'd see people keeping them longer if more people were willing to learn something new and get past their OWN limitations. Your boards already have the tools.., it's YOU that has to learn how to use them.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.