i guess it depends on the relationship you have with him?? for example, i own a small boat with a 8 hp motor.... my friend owns a bass boat... but his motor is not working... we have been fixing it, replacing parts, etc, and we have been splitting costs 50/50. we had to do a 3 hour drive to pick it up, and again, we split costs. however, its his boat, so any money i put into it, could be seen as a waste or lost money.... however, he is one of my best friends... in fact i keep the boat at my house... and i know once the boat is ready, i dont even have to ask him to use it if one day i want to go fishing with someone else and take the boat.... i could use my small boat, but his is better, bigger, faster, more comfortable...