I think for a lot of people it may be voting power and bandwidth issues. I've learned this the hard way myself lately. I've gotten so low on voting power that I couldn't even upvote someone a penny and saw that I needed to not upvote for 50 hours to get back to 100% voting power! And on the bandwidth, just today I saw I was commenting too much and my bandwidth was almost zero, meaning I wouldn't be able to do anything on the platform until it came back.

And I'm having all these issues having invested $100 in SP! Those people who can't do that and only have the delegated SP must have a really restricted diet of getting to interact. I am going to believe people are being as generous as they can. I look forward to having more SP so I can be more generous. I think there is some tie between SP and bandwidth too, though I'm not clear on that.