There is a lot of work that goes into producing a sample set, so any 'free' sample set is really a gift to the HW community and should be seen in that light. Commercial sample sets offer the HW user an excellent product, with product support and incredible value for money. For those who are unable to afford the commercial sets, you can still enjoy some of their sounds by listening to the demos posted on the various web sites, or to the performances posted on the Contrabombarde site. Please make it your job to support all of us by making sure that your installation of HW is as good as you can make it (even if that is only the Free Edition with a really good stereo speaker system) and then get your organist friends to play it (and tell them that your's is just 'entry level' technology).
Then, when you are able to, support the commercial sample set producers, as the organs released by all of them are superb
ps. The Barton 3/7 Theatre Organ sample set is a community effort from the VTPO Yahoo Group, I'm just the spearhead getting it to you.