In my oppinion, Yamaha know their market extremely well. The best selling sector is the ex-home organist and its where the Tyros (latin for beginner, first recorded use in english descibed a novice Piano Player) outsells the competition. I don't know how may sell in the states, but they dominate the market here in the UK and Yamaha have done a great job at building the Tyros to satisy their target Audience and making customers feel like they belong to special, cared for group. I know some of you guys use it professionally, but your certainly not the intended customer - just a bonus for Yammy. Introducing professional features would kill it off in a shot and make it too niche market.
What is more important than wavetable memory and pro features is the ability to sound like a pro at the touch of a button, larger clearer screens, big bright buttons, simple easy to navigate controls, a techical list of 'stuff' longer and more impressive than the competitions and when the owner gets bored, extra registrations he or she can buy to keep them going until they buy the next Tyros.
Yamaha marketing team have a strategy that is the envy of all the competition.
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I Love the name Tyros...its so cheeky of Yamaha...and they have pulled it off superbly

Noun - someone new to a field or activity
beginner, initiate, tiro, novice
unskilled person - a person who lacks technical training
abecedarian - a novice learning the rudiments of some subject
apprentice, prentice, learner - works for an expert to learn a trade
cub, greenhorn, rookie - an awkward and inexperienced youth
landlubber, landsman, lubber - an inexperienced sailor; a sailor on the first voyage
fledgeling, fledgling, newbie, newcomer, entrant, freshman, neophyte, starter - any new participant in some activity
tenderfoot - an inexperienced person (especially someone inexperienced in outdoor living)
trainee - someone who is being trained
[This message has been edited by Tonewheeldude (edited 07-17-2010).]