can MLM really be lucrative ?

depends

My teacher's daugther who are disabled because she's got a brain malfunction. (Like a down syndrome kind but not really) She can't attend a school. But , she get her income about $700 - $900 per month with Amway (his family also help her get start.

IIt deoend, am not against it but am not doing it as well.

Yes indeed, it can be lucrative. And you can choose, what you want: Little extra money part time or very good good money fulltime. The problem is, that many people misuse it to attract others with the wrong and selfish promise "to become rich, easily and fast". In fact it is a well established marketing stratety based on recommendation and needs hard and selfdisciplined work.... I myself am in Herbalife, who started some 20 years ago and anybody can join me on www.abc-trend.com since years ....any new distributor on an average has cost me more than 1000 US$ before he/she is successful and then will start my benefit from his/her success .... this procedure mostly takes more than 1 year of education and at the same time I maximum can coach 5 persons in parallel.

Yes. Initially it is very boring and unprofitable venture with cumber sum subject. If you stand out this period it will give you Royal treatment. Until then you have to work 24 hours for increasing the working hours of yours. Once you got another person like you it will give you extra 24 working hours. This makes your earnings double. So survive initially. Later spare the time more than anyone else.

Can be if you put in the work. It is not a get rich quick system, it is a get rich at your own pace and stay rich system.

If you are willing to learn and do, it can be profitable. What is it that you find boring about it?