When I (we) still did gig, I always tweaked and mixed the onboard styles and some converted stuff to fit for the songs we played.
Did as best as I could to make it sound 'our own way' as duo or trio, and not the same as everybody else when play styles as is.
Never used midifiles or other playback, but only live playing with use of styles, mainly drums and bass parts.
Nowadays I'm just playing for my own peasure, and still only by use of styles.

I buy styles or packs when I feel for it, and lately I was in a German site. Price €15 each style.
Picked 19 (now it could be 20), asked for a little discount, but got 'no way' as answer, but got urged to buy less if I could not afford it.
Since I like to have a 'collection' for a 'set between breaks' when buy, but I did not buy.
I did not ask for a discount because I could not afford it, but at the high price, there should have been easy for the seller.
I don't need those, but they don't sound bad, and it would be placed in the 'nice to have' category for fun and joy.
As Donny say, it's a lot of stuff at the keyboard already, and there is zillions of Yamaha stuff at no cost to find.
And a lot of it sounds real good, even at Genos with few tweaks / adjustments.