Therein lies the issue, this is the same way people advocate piracy of software, “we can’t afford it, it’s too expensive”. Perception is very much individual. Clearly from some comments on here, some think even $20 or $5 for an addon is “robbery” as “it should all be free”. Me personally, I can’t afford grove, so I look to free alternatives to get my trees & grass. I can afford HardOps, so I pay to encourage the developers.
I grant I have a horse in this race, speaking as a developer of over 30 years in the business, (retired), so I appreciate the work involved. Sometimes, only other developers can, (i lost count of the number of times I was told, “but isn’t easy, can’t you just?”.
Another factor is some developers may seemingly over-charge, based on their perception of likely sales, others may say, “better 100 at $15 than 5 at $50”. More people can afford it, the price is low enough that, unless you are dirt poor, it’s a “no-brainer”. Then again, if you’re dirt poor, your probably running hardware that can’t handle 2.80 anyway, as it would require a semi-decent system & GPU. So if you can afford $600 for a computer, you can probably stretch to $15 for an addon.