It may or it may not. If there are 50 pay-only pilots ahead of you on the list, you're not 200 - you're 150.
The lines a P/O pilot gets awarded still gets awarded to someone else further down the list. So, the ones in front of you don't count. The ones behind you just reduce the total number of pilots you would use to do the math on what your actual percentage is.

30 pilots and you're bidding #15 (50%)

With 10 P/O pilots in front of you, now you're technically bidding 5 out of 20 (25%).

An even split, 5 ahead and 5 behind, that's 10 out of 20, so you're back to 50%.

Obviously the percentage calculated isn't really as important as the number of P/O pilots in front of you, which move your actual bidding position closer to #1 and give you access to that many more choices.

When the bid for Oct comes out, check out the "you're bidding X out of Y" numbers you see when you click on the link on the PFC homepage to submit your bid. The way they come up with those numbers is by removing the P/O pilots from the bid numbers. Go to the bid seniority list in the Oct bidpack, find your name and number there, subtract the number of P/O pilots ahead of you from your number and the total P/O pilots from the actual total, you'll get the numbers displayed on the bid submission page.