When the gold rush came to cali in 1849, there were prospectors everywhere and most went broke. The money was in the services and tools the gold miners needed to mine and harvest their gold. The stores and shops that provided the tools and services were the ones that got rich, not 99 percent of the miners. Perhaps if you were to provide a bud doctor service to private growers, do house calls to check the temp, humidity, EC and PH and provide a weekly visit for a fee to monitor and keep plants that are out of range back into range. Have a travel kit with PH tester, TDS meter, A temp and humidity digital lcd. Test the run-off in the dirt, the tds and ph in the reservoirs, use a light guage and monitor the PAR with light meter, build custom scrogs, hang lights and fans, assemble tents, etc... you get the idea. 100 a week to maintain balance in a small grow of 6 plants for 1 hour service call. emergency call with same day response 250 etc... Once you build up your routes like a pool service you could possible make a living at it.. and enjoy figuring out and saving other peoples grows!