Based on some information I requested and received from President's Club (which is based on 2010 data) the ballpark one would have to be in to get "50 yard line" seats in A-Deck (not in the Club Section - which is a different payment methodology altogether) one would need to accumulate in excess of 4,500 "points".
Points are calcluated by both current year gifts to the University as well as cumulative giving over your lifetime.
Without getting too deep in the weeds, I will present the simplest case: Donor makes the minimum current year donation to obtain President's Club recognition and therefore receives a season ticket application - i.e., $3,000. Then, I solve for the cumulative gifting that had to have occurred in order to come up with the total "cost" of access to 50 yard line seats.
The formula for points is 0.04 x current year gift; and 0.02 x cumulative giving. So, in this case $3,000 current year gift x 0.04 = 120 points. To solve for the cumulative gift necessary to get to the 4,500 point level (4,500 - 120 = 4,380 points) we divide 4,380 by 0.02 and come up with $219,000 in cumulative giving necessary to have the conversation with Ohio State's Athletic Ticket Office as to when you can move into section 20A.
I'm pretty sure the present day answer is that there is a waiting list of people attempting to move into 20A, and one would need to wait until some current season ticket holder in the section either dies or fails to renew their tickets.
That said, I have learned recently that a new allocation methodolgy (which was tested with faculty and staff this year and apparently worked well) will distribute opportunity for better seats in a more dynamic and "fair" fashion in the coming years. (I hope sooner rather than later.) Essentially, it will be done online via a ticketmaster website, and season ticket renewals will be allocated by point totals. A window will open for each season ticket renewer based on their point total, during which the renewer will have the ability to choose his/her seats from any seats that are available in the in the stadium (excluding those allocated to student sections, and the Club Level, I presume) at that point in time.