Comment by zamnos

The difficult part is in training. Training in proper conditions is really hard because when those conditions are present, it's all hands on deck and the instructors can't be instructing because they're out actually deicing planes. So there's a bottleneck for new deicers to come on board. Plus the cost of the fluid (and the highly specialized vehicles), like you mentioned. The use case is a bit more clear compared to for welding, when anyone can just pick one up from Harbor Freight for < $150.