With my current wedding clients I think I have gotten as much as I will on UP Lighting add ons this year. My current lights work fine except for 4 of them. 1 battery powered Puck does not hold much of a charge and some of the LED diodes are dead. Another cheap plug in light has a malfunctioning fan. Another up light has a broken menu screen, and one of the other lights has a menu screen that is sort of malfunctioning. All these lights are 5+ years old except the 2 Rainbow 18 watt x6 lights that I purchased. I want to upgrade to those, but spending $2,000+ on more up lights does not make sense when I know it will take me a long time to earn my money back and start earning profit on those lights.
In the winter I might sell all my older lights on a lot style Ebay auction, and see what I get for the lights. Maybe use the money towards new lights. That might be the only way I pull the trigger on new up lights next year. ...That is also assuming I can get at least a few hundred bucks for all the lights I have now. With their age, and some lights in poor condition, I don't think any one will pay more than 25% of what I paid for them new.
thinking about this more...I will also have to invest in cases, or new bags. The bags I have now all have their zippers breaking or broken. I am carrying open bags around for transporting these lights right now. It just seems that it's just more money to offer the service, and not much return (at least for me).