I'm assuming you have multiple parsers that binds to different IPs to achieve 4 PPS without triggering the one page per second limit. Correct me if I'm wrong.
You are correct. The parser uses so little resources I can run it on a free AWS server, so I could have an unlimited number of them. But I don't want to overload the forum or risk getting banned - without Theymos' cooperation BPIP would not exist as it does now. On the flip side, I wonder how much I am helping the forum by reducing people's research time and page views.

As you can tell by the last parsed dates on a lot of reports, BPIP is doing a good job of keeping data in "near time". I project that once I am parsing posts as well, I will need a maximum of five parses a second. I'm sure this forum can handle that.
I use NordVPN to connect each of my home PCs on a different IP address. It's so reliable I am on it 24x7 and don't notice any issues.