This is unsustainable , and I've seen people on Twitch with bases raided 6 times per hour.
If this is a bug, please fix it.
If it's not a bug, explain what's happening.
I am doing soooo many raids, and yet my own Outposts haven't gotten a single raid in hours. I have three active Outposts: one Normal, one Dangerous, and one Brutal. One of them should get some activity, even a little activity, but nope, nothin'. Zero. It really sucks.
New game, tons of bases are available, but something to consider - try and make your bases look interesting. Some people will look at the thumbnail and make a decision.
Brutal maps also have significantly lower play rate. It was this way in Alpha and Beta as well. I have a sneaking suspicion it is due to the commonality of kill boxes, but also the much lower number of players playing co-op (which makes things much easier).
If this was the cause you'd see it in twitch streams as well, but people there are getting 10x attempts with bases that look similar to mine
It could be that people are raiding the streamers base through social. People knowing the streamers username or something and then searching them up in social to try out their base. That could be a reason.
Not from the streams I've seen. Streamers going through their active outposts with dozens if not hundreds of new gravestones littering the place.