I hate to be this way, but it just seems like there is a lot of cost cutting going on at all levels. Getting parts from these parts suppliers is probably fine in many cases, but then there are probably some that aren't actually supplying true OEM parts.
I talk to two local dealership parts managers and they tell me that even at their dealerships they have to be very careful, because sometimes (rarely, but it happens) a bad employee will get hired and then original parts will be removed from OEM boxes and replaced with aftermarket. hard to catch. I can imagine parts suppliers get tempted in this way also.
Not saying that that is what happened, just that it is worth some caution buying parts.
I was given a BPD water pump as a trial when they first came out. The deal was that I write up a review on it and put that review on several forums. My original water pump was still good, but I swapped it out for the trial. The BPD water pump worked very well for 7 years or so, but it eventually began to leak like you described on yours. I installed another one because I have been happy with their product.