At 3 x a year, I think it is worth decent used gear. If the choice is rental boots vs. gently used, I'd go for the gently used any day. Saves $$ over time, you can get a better fit, and no time wasted in rental lines both before and after you hit the slopes. For growing kids, gently used or season rental is about the same price, and also about the same price as renting on hill 3 times. Again, I'd go with the no line option. Also, at smaller hills rental boots are often unisex, and not as good of a fit for women.