Day 42 of the Great Stardust Drought
Another day in this drought. Another day Niantic is silent. My friends and I in the desert, pondering, waiting. A Rattata pops on our sightings. it's in the field grazing as we ambushed it. We grabbed each limb as one of us bridged the cattle gap, blood, guts everywhere just trying to get whatever stardust we can out of this little Rattata. Again waiting as another trainer crossed our paths. He began to brag about how much stardust he had when he showed us his 2,135 stardust. My friends couldn't control themselves. Poor kid... what to tell his parents? died for a just a little over two thousand stardust. Suddenly a pidgy appeared on our screens. We went running to it. the little bird saw us, welcomed us. It had great dreams of finding a pokemon trainer and being the best Pidgeot in town... little did it know the trainers had other plans for him as his feathers were plucked, his feet cut off and his eyes popped out, ribs ripped from his body for whatever stardust he was holding and carcus thrown to the side of the road. I checked on my Dragonite, it needs 9000 stardust to power, only 88 more pidgys and rattatas. Another day in this drought as come another bloody day as left...

Answers
No need to get defensive about spending money. There's nothing wrong with that, and it doesn't make you any less of a player. It is playing a different game, however. Spending real money on incubators is essentially a way to buy stardust, and I'd like to know whether, and to what extent, that accounts for his daily stardust total.
Due to reduced gym coin rewards, I am generally only running the infinite incubator, except for the rare occasions when I get a 10K egg. If someone is constantly running nine incubators, it is not meaningful to compare his daily stardust totals to that of a free player. Neither is better or worse; it's just an apples-to-oranges comparison.
the location is also an issue if i grind for an hour in my own town i might get 5- 10k dust with say 1.5k coming from eggs and the rest up to luck on the catches.
If i drive 25 mins to the coast then i can pick up 15k + in a couple of hours easily (also is flatter ground so often jog instead of walking = more hatches)