Keep in mind: the IRS treats myRA as a Roth IRA account - all rules (contributions are post-tax) and limits apply.
TOUCHE! I'll give you that one. But answer me on the $15K limit.
From the myRA.org website FAQ #9: How much can I save with myRA?
You can put in (or contribute to) your myRA as little as a few dollars a month up to $5,500 per year (or $6,500 per year if you will be 50 years of age or older at the end of the year) but not more than your earned income. The contribution limits listed are for 2015 and they may change in future years. Money in your myRA continues to earn interest until your account reaches $15,000, or 30 years from the day you first funded the account (whichever comes first). Then the balance will be transferred to a private-sector Roth IRA, where you can continue to invest your savings and make additional contributions. You can also transfer or roll over your myRA to a private-sector Roth IRA of your choice at any time.
This is designed for someone who can't save up $1,000 at a time without finding something shiny to spend it on.
But realize this is a
Treasury Bond investment... This from FAQ #6: How is the money in myRA invested?
The money you put in your myRA account is invested in a United States Treasury savings bond, that safely earns interest at the same variable rate as investments in the Government Securities Fund for federal employees. The return for these investments was 2.31% in 2014 and 3.19% over the ten-year period ending December 2014. Past performance is not a guarantee of or prediction of current or future performance.
So it *might* keep up with inflation. Better than a standard savings account. Safe - backed by the US government. AND does not take advantage of the growth / losses in the stock market.
Assumptions: $5,400/year contributed. Annual_Bond_returns=2.3%. Annual_Market_returns=7%.
myRA: Total Saved = $16,950
Roth IRA: Total Saved = $18,570
BOTTOM LINE: Contribute $450/month to a Roth IRA, and accumulate $1,600 more over 3 years.