I'm not certain what the qualifications are for being in the botched category as there are many girls in the 3k+ range that are problem free, but I think we have seen a few with expanders fill to soon post surgical and create their own problems. Strings presented their own problems, but some saw success. Others are by accidents like Lacey Wildd and Lilly 4k; the bigger the boobs, the more challenges there are. And still others like Allegra had physical breakdowns fixed. There any any number in the 3k-5k range that we seldom even address on this forum, like Tammy Hernandez, that remain problem free.
It may be just my humble opinion, but I think patience and proper planning are huge factors often overlooked. Foxy hasn't had any problems, however, she admits that she should have gotten an internal bra when she got her expanders; getting the things she wants now at her size certainly increases the likelihood of complications. Of course, when she went to Belgium to get 2k implants, she would never have imagined that she would end up with 10k boobs and still want more; boobie greed is simply wonderful when combined with expanders. I still maintain hope that she will find custom made enormous expanders, and hope that if she does, she does everything right and exhibits the patience necessary before filling.