You won't get rich from video poker even if a machine pays 100%+. At a fast 600 hands per hour, and $1.25 per hand ($0.25 x 5 coins), that's $750 wagered per hour. If you play perfectly (no mistakes) and realize your 0.77% advantage, that's $5.78/hr. on average. You'll also need several thousand dollars of capital to fund the losses you'll suffer while waiting to hit the royal flush. Yes, if you were capitalized you could play at higher denominations, except 100%+ machines are rarely found at anything but quarters and below.
You will also learn the layout and importance of the pay table, as well as how to properly bet while playing video poker. You will learn and understand payback, return, house (and player) edge. You will learn about the implications of variance, sometimes called volatility. You will also learn what the term random really means when playing video poker.