"This presupposes the client actually needs more advanced equipment."
Many SMB would like to grow, implement new products/services/foo, or just plain spend less time carving wheels from old process rocks. But, digging their rut from the limitations of their equipment, they forget to look up out of the rut just keeping the business going. Been There Done That Have the T-shirt
You'd be surprised how many SMB would spend for the used 3750 at $125 if that would remove just one process rock. For example, this one "sales" guy could not figure out how to use the DOS based quote system to generate new quotes from previous orders. He would delete old orders and manually re-enter them, instead of updating them, to put in new pricing. I started putting manufacturing process information on the orders and process times for cost analysis. And then bozo would delete them.
For the cost of a network switch, some HDD drive space, and a tape box, I backed up the database to my CAD/CAM box. And when bozo weren't looking, I restored those entries he deleted. The owner was quite pleased at the increase in manufacturing turnaround.
And then the bozo deleted the whole database and I walked out the door -- all the data was still on the CAD/CAM box and tape; but they never found it.