I bought most of it.
However, since i'm from a different country than the US it takes a few months-years between each book to be published (the market is mostly hard covers/trade paperback here, i don't think there's anything other than capeshit that's published in their original format and it's a small niche, especially in France mind you) and i was on /co/ everyday at the time. I was living with my GF, a book seller, it was our hobby as well, she even got interested enough in Hellboy to buy some herself (and keep some of it...). Anyway, with the win-O + storytime threads of mignolia stuff appearing on this board every now and then i was able to read what i'd be able to buy later on, but the very end disapointed me enough to make me lose interest and not get them. On top of that i moved to a small city, it's harder to spend some time in bookstores which have the exact same prices as Amazon, the whole book business being protected by the law, etc, but i digress. Maybe i'll pick up the last 2 books i gotta read but the 2-3 very last issues really were a let down for me. Enough to not want to support financially the people who got me hooked on that universe for a decade.
If anyone has a link to DL some .cbr of what happens after Johann gets in the vril armor i wouldn't say no.