Look at two things. The play through says how many times free coins must be played before they count. One time is normal. Two times makes the bonus worth half as much.

The minimum says how many Sweepstakes Coins you need before you can cash out. It is usually 50 and sometimes 100. A bonus of 55 coins with one play through and a 50 coin minimum can become a prize without a purchase. A bonus of 2 coins cannot, not without many days of free daily coins.