This actually seems to be a very YC kinda thing, presumably because of the extreme obsession with growth. I signed up for a vendor to check out its features the other day and had 3 different sales people email me each of the next 3 days asking if they could help. Another service did the same "we miss you, you haven't been back since..." How does any of this stuff provide value to me as a user? It genuinely seems like they don't give a shit about their users and simply want people to visit the site so their metrics will stay up.