NW Mourning - this is a good point and speaks a lot to the autonomy that has to be given to a businessman at that level. It is eventually a tool that the acquirer himself / herself is using. If I use work money to buy a mac instead of a PC because it makes 'ME' more productive and therefore a better asset to the company [assuming it runs all the work programs I need it to] - then by all means I should.

I guess the only ethical issue, as flyinbob mentioned, is the fact that I could be accepting personal gain at the net cost of the company. Example - I choose a mileage run that takes me 1 1/2 days to get to my domestic destination just so that I could use the miles for an upcoming family vacation. And for the sake of maintaining this extreme - I also get blitzed at all the lounges and first class cabins I occupy - thus not providing any avenue to work while travelling.

But, I guess companies take this risk when providing any increments of autonomy to their employees. (remembering the 100 USD paper clip at a recently audited government agency )