The other 49k simply lost BTC or ended up with a financial brick (not made of gold).
It's true that not everyone complains. Not everyone goes online to file a complaint. Most of it is done through emails that the company regularly does not respond to for weeks or even months...sometimes never.
Don't believe it?
Go read their forums:
https://forums.butterflylabs.com/post-sales-customer-service/-------------------------
As for the reason why you don't see even more complaints. The people who run BFL forums have placed very restrictive controls on how people sign up. Even up to moderating many newbie post(s) until they are sure people won't post something negative about the company. Therefore there is a lot of posts that simply never show up.
For a company that has well over 50,000 customers....you'd assume there would be more traffic.
Sign up, and see how they review your posts before you can actually post it and have it committed live. Even folks with legitimate claims and anger can't post. I think someone even mentioned that they also restrict PM's between members. Unsure if that is actually true. But it wouldn't surprise me if so(or anyone).
What you see is just the tip of the iceberg.
If you are looking for an ASIC miner...look at another company
and be successful at mining. Ask members what they think is a good mining company to buy hardware from. And most importantly how long it will take you to receive the miner in your hands. In that respect, don't believe a single thing BFL tells you.
Hope not!!!!! 
