Re: What went wrong with the last Forum Design Pickup (fuglybucker)?
Correct. The Custom 5 existed before the forum popularized it as a mod, but the forum did raise awareness and encourage (pressure) Duncan to release it as a model.
The success and failure of these forum pickups, from my perspective, loosely correlates to the level of design by committee. it's just not how good product is designed. There's a reason the phrase "design by committee" is a pejorative term. It's a laughing stock of product design.
The Brobucker was not really that. There was some banter about A4 vs degaussed A5, mismatched coils, etc. but in the end people let MJ be the final arbiter. The Phat Staple was designed in house, then mainly produced and sold as a discounted forum run.
Something like the Fuglybucker, to me is best described as a mashup. Not a purpose-driven design, where someone said "I/we want the pickup to to THIS" and then the design followed, to hit the target. It's similar to when a guitar designer mashes a Les Paul body with a Tele bridge pickup, Rickenbacker neck pickup, a banana headstock, and a Strat trem. (And it doesn't fit in any standard guitar cases) it's a bit of a novelty. It may make a sound you can't get elsewhere, but the appeal will be limited.
Historically, the best selling, most popular designs have never been designs by committee. But in a way, that IS one of the benefits of a forum pickup. You can go off-script and have a wacky custom made at a reduced price for everyone, and then people feel like part of a little club; a bond. So was it a success in that regard? Maybe.