Just my 10 cents here ... as someone that used to design and implement custom file systems, I'm well aware of a) How much work is involved, and what a truly splendid job you guys (guy?) have done with DrivePool. I have two fairly large pools running (8 drives 30TB in one, 4 drives 16TB in the other), and have to say zero loss of data ever, and remarkably few problems.
Given how cheap the product is, I would have absolutely NO problem with paying an annual support fee. I suspect that you might see a similar response from the many, many customers who have NOT contributed to this thread. Keep up the good work guys, and don't be put off by the haters/whiners.