Very little breastmilk output despite efforts

Could some people just not have enough breastmilk to feed baby? I've spent so much money on lactation massages, consultants, cookies, tea, juice, food, pumps and I am still pumping no more than 70ml each session. Wanted to bf baby exclusively partly because we wanted to save money on fm. Turns out that the few thousand dollars I spent is more than sufficient to buy 100 tins of fm. I'm so tired and depress and demoralise each time i see the output after pumping. Baby keeps crying because i can't produce enough milk for her.