Kawasaki contracts with Dunlop for a universal tire to put on the bikes as they assemble them. You can't actually buy that exact tire as an aftermarket, however Dunlop offers the ROADSMART sport touring radial and it gets very good reports from those that want a general use tire.
The problem with the stocker is that it tends to get squared off pretty fast if you do much super-slab. Some of the more advanced tires out there have a multi-compound construction where they put harder rubber in the center and softer on the shoulders for corning. They get high marks from performance riders that have to do a lot of slab work.
Canyon carvers want more of a sportbike tire - they are softer, stickier, and have a more pronounced profile to provide a bigger patch leaned way over.
Riders that experience wet pavement will choose something targeted at that medium. Some are better than others.
Touring and adventure type riders that will see some off-pavement want something with a better grip on dirt, even going as far as a dual-sport knobby type tire.
It's best to stick to the standard size tire as that's what fits on the rims best and will provide the best handling on-road.
Each brand has tread styles that target specific uses, and mostly they are all pretty good tires or they get a bad reputation and people won't buy them.
And yes, price wise they are all over the board, but generally it's about $250-$300 for new tires. Some may be a little less and some a little more. Most riders want 4-6K miles out of their tires, some want more, some will live with less for specialized applications.
The neat thing about the Versys is that it gets used with many different riding styles and terrains and there are tires to help you do your favorite better.
2009 V - custom black-on-black - SOLD