The only thing you have to worry about is the life expectancy of the componant. But lets face it are any of us going to worry when our CPUs life expectancy goes down from 15years to 10years?
Will you be using that CPU in 10years? (Assuming you run it at 90 all the time)
I've always wondered why people worry so much about the temp of these componants, they are designed to take it like men and in many cases have autoshutdown features to make sure they aren't damaged. There are almost no saftet conserns either as the protocols under which said items were made make allowances for this.