Different trajectories: Banksy's work is rooted in street art, which is historically priced at zero or less and/or priceless, i.e. usually not removed from sou

Different trajectories: Banksy's work is rooted in street art, which is historically priced at zero or less and/or priceless, i.e. usually not removed from source (exterior walls of public infrastructure) and viewed as expense by local govt (cost to clean off) but may simultaneously be loved by residents in the community it's located in. It's also subject to unexpected change or erasure (destroyed or painted over by municipal govt or other grafitti artists). So, it's not surprising that it took longer for Banksy's work to reach $M price levels. In contrast, Koons' work is commercial to the core and on a grand scale (per physical size, amount and cost of materials, etc). The upper bounds of pricing on his work is open to debate but the lower limit was always meant to be significantly above zero.