That's actually not a major problem. First, you can avoid a No-Show by contacting the airline and cancelling your seat on the flight. You basically asking to change the ticket but without selecting a new date for the flight - and thus, usually, you won't be charged the change fee yet. Second, even in case of a No-Show the airline would have a problem to collect the fee as you can always refuse to pay - and I highly doubt any airline would want to go to court over this fee (given a regular customer who bought a business class international ticket and missed one flight).

IMO the only worry is the FF account because it's an easy target for the airline in case it wants to 'punish' the passenger.