Wait until they hear about people travelling in camper vans that cook their own meals and just park by the roadside for sleeping! Or even worse, bicycle tourists who bivouac by the river, they don't even buy gas!
I wouldn’t put bike tourists in that group - because they are incredibly low impact in comparison, and in my experience most bike tourists are spending money as they go - either on accommodation or food.
Sure, camper and bike tourists probably don’t contribute much to local economies, but they also have negligible negative impacts, so what’s your point?