Agreed, ShaferCustoms.

After paying salary/hourly employees, payroll tax, rent, GL, WC, truck note, truck insurance/maintenance/depreciation, gas, tool expense (broken bits, etc.), tool/computer/etc. depreciation, stocking costs of wire and parts, permit fee, office expenses (electric, cell, paperclips, etc.) and staff (even if it's you) to design, walk through, invoice, follow up, pull permit, etc. you probably lost some money (maybe a lot of money).

Like I said, I'm not in the per drop business, but anything around $100 seems really low unless you have huge economies of scale (like lots of cheap/1099 employees and lots of big commercial projects that have hundreds and hundreds of drops).