My random thoughts pre-coffee...
For us bottom feeders looking for cheap wall hangers but don't want what everyone else has. HomeSense/Winners will have some interesting stuff from time to time. More prints/manufactured items but at least they tend to be low volume in the stores per item so not everyone will have them. In contrast, Ikea, odds are any city dweller will recognize it.
As for real art (paintings), it does cost some money to create. Materials, time, space, etc. It is one of the reasons old (call them used) paintings will often go much cheaper than new as any attempt at cost recovery has sailed. An annoyance for me at the same time is how some artists feel society owes them a "living wage" for their efforts. Well they made something on spec and what is worth is what the market will pay, which is not likely a living wage as a career for most. In contrast, say an engineer, doesn't generally go around designing bridges on spec hoping someone will buy their design, no they work for someone and design what they are told... Want to do art as a living, work for a company and create what they want not what you want (or get famous).... Like the canopy bed I just built for my youngest, $600 in materials (wood etc.), plus my time, tools, etc.... likely could have just bought one for $400--not the point but it is a hobby not a career.
At my office the building is used as an art gallery of sorts. Local artists, all have purchase prices, they get swapped out a few times per year. Not many get bought but it does something to help the local artists. BUT the entire living wage thing is expected by many of them.
Our kids have some talent (as a hobby) so we have some decent items from them in recent years. Also a big fan of blowing up pictures we have taken.
As for motorcycles in the house. I tried but my wife's father (former flat-track racer) had a large collection, easy 50+ bikes--race and road, and of course many bikes in the house that were in various states of disassembly... so she put her foot down as a no hard on that one.