This decision was likely not made to rip-off some more moneys, but because of bad quality. If any bugfix might as well introduce two new issues, you don't deliver the fix if it isn't needed. The whole "if it ain't broke, don't fix it" saying has some of its roots in that environment, maybe even all.

This approach is wrong on many levels, but fixing the real cause is often a bit more work than "a hundred junior dev hours". In the meantime, you have to deliver to customers.