That is true. it pretty much falls down to how lazy the developer is. One other thing it could count on is other people. you see fan games like sonic after the sequel and Super Mario Bros x out there, as well as hacks such as Sonic Megamix and Project M. They all have one thing in common. Its that they involved multiple people to make them. Most fan games/ hacks involve multiple people in order to become a fan game/ hacks that people will try and play. If only 1 person was involved in a fan game/ hack that was going to be as good as the ones I said above, then it would ether take forever to create, or not be finished at all.