If I fall will you pay my bills? If its wood and I gaff it... At least one, maybe to guys are working with me to rig and raise the equipment
High work comp rates are pretty steep... That's why the quote is high... Insurance for that kind of contracting is high.
If I was doing a radio tower I build it so it could tip over and equipment could be serviced from the ground. That's an old steeple jack trick and how lots of tall stuff is built to service. We build tall towers and tip em with a crane.... Lots cheaper and safer that ginning stuff up aloft.