See? The fees get paid to the people with the most money, ie, the developers and early adopters, while the late adopters lose all their money. What, you thought he was kidding when he said it was a pyramid scheme? 
Fees get paid back proportionally to each account. So if you have 1% of the MicroCash (28000) you get 1% of daily fees (account and transaction). So the more MicroCash you have the higher the percentage of the fees you get. It doesn't necessarily reward early adopters, it rewards people who have MicroCash. I'd say anyone who has SolidCoin now or will mine MicroCash is still an early adopter as there are only around 1000 users of SolidCoin right now. Many people say if you're involved in Bitcoin right now you're an early adopter.
When MicroCash starts you will need around 50 MicroCash dollars to get interest. This doesn't include transaction fees, the more transactions there are the less MicroCash you need to get interest as all fees are collected up and distributed proportionally.
Basically to use MicroCash you have a fixed daily cost of $0.005 per account (or half a cent). Users will still get some reward back for even a small amount of MicroCash, so their daily cost will be less than 0.005 , completely depends on how much MCD they have. An example, if you had 1 MCD in an account you would get paid 0.0002 for that amount, so your daily fee is essentially 0.005 - 0.0002 .
If there are 2000 transactions a day , that is an extra ~15 MCD to be distributed to all accounts as well as all the account fees.