Bonuses
I believe that taking good bonuses, and playing during all the special event days (such as deposit & play $20 for a chance in the lucky draw) can enhance the edge in the players favour. Low rollers have an advantage, as 9c play is better at extracting value from bonuses, but patience is needed. Low rollers should not look for large bonuses, as these often carry WR that help high rollers. Many casinos offer 200% to 400% slots only bonuses, but the actual amount is not massive, often only a $25 or $50 deposit gets the bonus. The WR, even if 30x on slots, is favourable since much of the money is bonus and a bit of luck can enable a profit. Also, look for decent comp schemes and always sign up to the "players club" if not automatic. This could add an extra $10 or $20 to the outcome of wagering a bonus.
At 9c a spin, the 400% on $50 (total $450 at 30x WR) gives $13500 WR or 150,000 spins. At 1000 spins an hour this is 150 hours of solid entertainment for $50, and every chance of getting the $50 back or winning.
Some casinos offer low bets on other games too. The VP at some MG casinos in the Casino Action group allow a 1c coin on the 4, 10, 50 and 100 hand variants, which allows 20c per set of 4 hands on the 4-UP, with the Royal Flush paying $40. Blackjack, 3 card poker etc can go down to 50c. There are other casinos that take this to new lows, with 1c Blackjack mentioned in the forum.
In terms of how well you have done, it is not the absolute amount, but the profit relative to the deposits. Winning $20 from a $10 chip is better than winning $1000 from a $1000 deposit in terms of percentage gain. The big payouts often are a result of heavy spend per game or spin, and represent payout, which is not necessarily an indication that the player is ahead by that amount in the overall session.