It is exactly because of insurance(suprised they haven't taken over the world yet). Even though I'm a 4000+hr pro pilot, I get haggled by customers insurance because they want to know my exact time-in-type, etc... One of our local's just brought in paperwork for myself and my co-worker to fill out for flying his Saratoga TC. Just part of the deal I guess.

Luckily my companies insurance covers us well. I can hop right into anything, including planes I've never flown before, and it's all good.

Everything outside the Airline world, insurance is a huge factor in how aircraft are operated and who they are flown by.