Hi Zeratul,
I agree with Bungle that I don't feel it is Roland's duty. In regards to the XP-30, I'm not sure how many sounds come with it. I own an XV-5080 which comes with many banks of presets already out of the box (User bank + Banks A thru H). This is without any expansion boards.
I, too, have a ton of patches. I always have tight deadlines so I haven't even listened to all of them (I also own a few other keyboards and modules).
Anyway, if the stock XP-30's sounds don't do it for you, why on earth did you buy it? I'm assuming that you have other uses for it. If you don't have the inclination to program these types of sounds yourself and can't find any to buy, then maybe you should buy a Korg keyboard. You could maybe pick up an 01/W which will do many of the types of sounds that you're looking for. There are 3rd party sound developers out there as well that you can try which may offer sets like this. Don't want to buy any but want them for free? Well, Korg won't help you out much either when you're looking for new sounds not present on your keyboard. I own a Trinity Plus and any of the extra patch banks for it from Korg must be bought. They are not freely downloadable.
Anyway, I don't mean any offense by my post but there are options for you in the form of 3rd party sound developers (check out the Roland section of this site at the bottom of the page I believe) or you could get a used 01/W by Korg.
HTH,
fv