My RSS reader YOShInOn uses superfeedr to ingest RSS feeds which I am highly satisfied with except that it costs 10 cents/feed per month. If a feed gets 100 items a day it is a bargain. I have a $10 a month bill right now, ingest about 100 feeds and get about 3000 items a day.
I'd like to add a few hundred independent blogs but it would be crazy expensive for a small amount of content. I could build my own RSS crawling infrastructure but no matter how you slice it, polling all those feeds would be a hassle. There used to be quite a few instances of
https://en.wikipedia.org/wiki/Planet_(software)
but today I've only found a handful worth pointing YOShInOn at and I'd like to see more.