Congrats to you and another strong season. I think it is wise to stay out of the presale, especially if you cannot make immediate use of the extra benefits for being on the leaderboard.

You are also correct that a lot of people (especially the whales at the top) will be dumping RF cards onto the market because they are mostly searching for GF and BF cards. Some people will snipe GF, but most will look to sell GF and buy into RF. I think it is a good place for you to set up some bids and snipe cards at cheap prices. I will likely have some rf singles to sell, and maybe even some max copies for rental if I can get my hands on the GF and BF early enough.