I would suggest that you are not locking up profit at all. What age were you when you first started gambling? How many sessions have you gambled in your lifetime? What was the outcome of all of them? But let's make it easy.
Example:
You've gambled exactly 3 sessions in your life.
First session you lost a thousand dollars.
Second session you lost 500 dollars.
3rd session you stopped/paused for the day when you got 500 dollars ahead.
So.....you locked up the profit? What profit? You're still 1000 dollars stuck.
What I'm suggesting to you negative expectation gamblers the only way you can show a profit is by creative bookeeping. In other words, an artificial starting point. If you go back and include every session you ever played in your life in the statistics....you are a big time loser. And you, Alan, have admitted to never having a winning year.