Chuff me, there's enough batsmen moaning about Yorkers in the nets as though it were heresy. For most people playing club cricket, there is a nets session, where you bowl. You practice what you can in that. As a bowler, it would strike me that Yorkers would be a good thing to practice.
If you don't like it fine, but may clubs don't have the luxury of a dozen nets and multiple occasions a week, so berating bowling Yorkers seems a little unfair to me...
Now, back on topic!