If you play for more than a few minutes, there's very little difference in the player club practices of basing points on coin-in vs. coin-out. Since most all slots and video poker hold less than 10%, long term, your player points will be about the same either way. Note that coin-in means the value of coins you've played, not that you inserted into the machine. With winnings accumulating on almost all modern slots, your play from the meter on the machine is the same as play from coins (or bills) you have inserted.

Likewise, coin-out is ALL your winnings, whether you cash out or let them accumulate on the machine's counter.

With points based on coin-out, you will get a few more if you are lucky and win more than the theoretical win on the machine. Likewise, you'll win a little less if the casino is lucky and you lose more than theoretical hold.

Do the math, it makes very little difference after you have put a few hundred dollars through a machine as your coin-in will be about the same as coin-out. For example, if you put in $10 and play a 25c slot for an hour at 500 pulls/hour, you have played $125 (coin-in). If you ended up losing your $10, your coin-out would be $115 (even though you didn't get any money out of the machine). If your club pays 10 points per dollar, the points would be 1250 vs. 1150. If instead of losing $10 you broke even on your play, both methods would yield 1250 points.