The problem I have with used wood stands is that you don't know how it was maintained. Wood can be damaged by poor maintenance (e.g., left to neglect outside, repeated temperature variations, water damage), although you probably have examined it and found it to be in tip-top condition, I personally still have concerns.
I agree with others however. Reinforcement done properly is inexpensive and provides a big safety net, especially with a used product. Some of the ones shown above look darn good and well worth the effort, imo.