I can't help but smirk when my company gets a project that requires knowledge on something I warned them about over half a year ago. This happens regularly but every time we have to get that knowledge during the project, costing the customer additional money.

When will management learn that training your employees will benefit them :(

If the customer is willing to pay for your training (You said it cost the customer additional money) then management probably understands the benefit of training their employees but might consider it even more beneficial to have someone else pay for that training (the training still gets done after all and real projects is one of the best way to learn)

@ItsNotMyFault the extra cost is always during the project and received with a lot of protest. But because they're already at a point of no return they have no choice but to pay up. Not a good way to start a business relation if you ask me...

Sometimes we get lucky though and things work right away but that's pretty rare

@ItsNotMyFault I see your point though ;)