[neltnerb]

Yes, you should charge way more for your off hours for sure, or else you'll never ensure the number of hours is sensible.

When we first started we charged way too little, and they had us doing simple jobs because our cost was lower than an employee. Charge them enough that it's worth it for them to have their own employee to do the easy stuff, especially if you already have a full time job. There's not that much risk of not finding work since there's a built in backup.