1) Person A makes a crappy bandage (Y units of quality) with X units of budget and markets with 9X units of budget
2) Person B makes a decent bandage (5Y units of quality) with 5X units of budget.
If person B were to also market the bandage with 5X units of budget, they will take a larger fraction of person A's market share than if they don't, thus providing more value to people. Yes you can argue that if person A didn't exist, then they wouldn't need to spend this money and the bandage could be cheaper, but this is clearly an example where adding marginal marketing can be a net benefit to society.
> And the word can get out fine by itself, actually.
Umm, good luck with that. There are only a few, small, specialized businesses for which that is true.
The core topic in this subthread is focusing work on marketing the bandage instead of making it cheaper/save more lives, because marketing has much better ROI than actually providing value to people.
And the word can get out fine by itself, actually. The word of mouth is a pretty effective thing - and a lot of marketing is trying to game it, getting increased profits by destroying its usefulness.