The MIT license does not mean that you cannot ask for money. You can ask for money if you wish to do so. However, if it is properly supposed to be "open source"

The MIT license does not mean that you cannot ask for money. You can ask for money if you wish to do so. However, if it is properly supposed to be "open source", then nobody should require to pay licensing fees, and anyone should be freely allowed to make copies, modified or unmodified, and distributions, including other programs. If you wish to ask for money for code review and other stuff, OK, and then someone who does not want to pay (or cannot pay) can do it by themself instead if they wish to do so. Even so, open source does not necessarily mean that you have to accept contributions at all (whether you accept payment or not), but other people can distribute a modified version and can accept contributions if they wish to do so.