Because a lot of individual tradespeople buy Transits and F150s and F250/350 - plumbers, electricians, delivery services. I think commercial fleet buyers do a lot more research, RFPs, etc. and deal with their fleet sales people. They do a lot more research on capacities and limitations and volume discounts. Totally different buyer. Nobodybuys a fleet of F450s because they saw atv ad.
The local dealer is trying to win local fleet sales by showing they have whatever you need.