I'm not reading all the horseshit responses in this thread, so if somebody has already said this, fine and great for them.
$50 is significant to most people. That's about a two hour trip each way, give or take? Anybody with a cerebral cortex should be able to figure out that it's going to cost a chunk of change and offer to pitch in, or at least be willing to help when asked.
Assuming you're not an asshole or psycho or hiding important info, if your friend instantly accused you of only wanting the money, he needs to chill waaaay the fuck out. How are you even friends with someone who's that on edge? Are you an asshole or psycho or hiding important info?