I've been using this site for at least the last 7 years. In all this time my win percentage has been 17%. It's never dropped to 16% or risen to 18%. Does this mean I'm set to only ever win 17%..?
17% is a good ITM percentage. I don't know what you mean by win percentage. Are you talking about tournaments or cash games. If you are talking about cashing in a tournament then 17% is a solid number.