Fabriccoatings have improved so much that a hydrostatic head of 10000 is readily available, I have seen jackets quoting such a figure.
I don't see a hydrostatic head of 3000 being a 'con', in fact 3000 is very very good, assuming the fabric, coatings, seams and zips are all in good order, then it will not leak.
A mere 700 HH head is considered waterproof, I have camped in harsh conditions with a tent of 1000 HH without any water ingress, a 2000 HH is common now in even the very low cost tents.
So the 3000HH would not be a concern for me, the price - well ???