When I see someone bet decimals in a regular poker game, I just round it down or up to decide if it is worth going into the hand. It does not affect my play, in fact it shows a person with too much time on their hands, maybe they can open another table if they have that much time for typing to earn a better return per hour.
I also see people out there bet 1.23, 2.34, 5.67. Really nothing strategic. At best increases your payout a few cents one way or another. Also, I see this type of play by people who are in way too many hands. Just my opinion.