The problem as I see it from a weekend warrior, tinkerer, technical point of view is as follows:
1. The majority of SB is not open afer the standard set of work hours (m-f, 8-5)to allow for other run of the mill people to purchase goods
2. The SB is engaged in a trade based (can not remember the exact name for this) buisnesss such as window tinting, hardware supply, or other wholesale or redistributor only market that will not sell to the "common folk"
3. If the SB will sell to regular person, their inventory is not easily accessed.
There are other thingsto list, but n essence a big company needs to ge tthe common person unlimited access to the tail of the dragon type of goods.
An example would be if i need a hydrolic actuator at 3:30pm on a sunday afternoon,but i am a software engineer and can not call up local plumbers union to get one.