I used to take on every small job that came in the door. However, with these smaller jobs create a bottleneck for larger jobs, it soon became obvious to me that I need to start saying no to some of them. This is especially true during busy times. I will almost always take on any vehicle, sign etc. as they are the best money makers for me - cut vinyl jobs.
I do have a minimum dollar amount of $25. For some of the tiny jobs I feel might be a pain, I tell them, "I can and will do this if you give me creative freedom" which means we aren't going back and fourth 5 times to pick the perfect font etc. Most people are totally fine with this. I have several lady customers who order a lot of hoodies and tshirts as gifts. They send me a couple picture examples, tell me what color htv and shirt color. I never send a proof, they just trust me to get "as close as possible". These are the best customers and work good as filler jobs for me. I also have some old farmer guys who come in for tractor decals, they know how I operate now and they told their friends so probably next month I'll be doing quite a few decals again, during the slower months LOL Some jobs and people are just fun to work with so they extra time is worth it. It's about enjoyment also. I turned down a 40 year boat stripe removal/install today because it would be hell on my back and fingers...NOT enjoyable LOL
I am curious why you don't do vehicle installs? Cut vinyl is a good money maker for smaller jobs like pick-ups etc. It's my favorite type of work and I make the most money on it.
50% of my jobs are bigger (vehicles, trailers, window 4x8 signs), the rest medium and small. Not many tiny little jobs but I do them.