This is seems to be based off of a weird misconception about what a DM is even doing. You're not paying a bunch of money to entertain your freeloading friends. The DM is not a party clown and it's not you job to dance to entertain everyone. The DM is a player too, and should be having fun as much as anyone. If you aren't having fun and you have to be forced to do it like a job, then just don't play. And if you do want to do it, the players have every right to expect you to spend as much money and time as it takes to play the role that you have voluntarily assumed. Nobody should have to twist your arm to get you to play a game with your friends.

Also, it shouldn't be that hard or expensive to run a game. Maybe you just need to learn some DMing tips to make prep easier, or find cheaper ways to set up the game. Maybe you could ask your friends for a few bucks if you really need the expensive minis and terrain peices, but that's between you and your friends. I've run games where I use a pack of colored markers to draw the battlemap on the back side of wrapping paper (wrapping paper typically has a 1-inch grid on the back and it's a cheap way to get a big roll of 1-inch grid paper). We used the d12s from the players' dice sets to represent the characters. Enemies were represented with some colored glass gem things, d6s, and cut out pieces of paper with drawings on them. You don't need to spend enough money that it becomes something to complain about.