I've done some BOM's that I REALLY, REALLY liked the blocks and had a plan when I joined. Those I finished. Most of them were when I started quilting and was still rather unfocused. Now I have too many planned projects, with purchased fabric, to even be tempted to start a BOM. I do remember the fun being returning to the LQS with finished block in hand to compare to the other participants. On that one, you purchased the first block, then if you returned on the first Sat of the next month with that block finished, you got the next block free. If you got behind you could purchase the block kits for $5. They made their money on the finishing kit; borders, binding, etc. I ended up donating that quilt to the local chapter of nurse-midwives to raffle as a fund raiser.
I also laughed when I read your signature!